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WillSams/openplc_modbus_examples.json

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Node Red / OpenPLC / Modbus
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openplc_modbus_examples.json
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{
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"name": "For our own memory map, we can define how big our registers can be.",
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"initialize": "",
"finalize": "",
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"x": 210,
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"wires": []
},
{
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{
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"type": "modbus-write",
"z": "feaffe784243c357",
"name": "Set variable2",
"showStatusActivities": true,
"showErrors": true,
"showWarnings": true,
"unitid": "1",
"dataType": "MHoldingRegisters",
"adr": "24",
"quantity": "8",
"server": "2dadfc00.5aa6a4",
"emptyMsgOnFail": true,
"keepMsgProperties": true,
"delayOnStart": false,
"startDelayTime": "",
"x": 310,
"y": 380,
"wires": [
[],
[]
]
},
{
"id": "890cc9ebc36e2fd4",
"type": "comment",
"z": "feaffe784243c357",
"name": "For the following example, we'll assume a big-endian architecture. ",
"info": "",
"x": 250,
"y": 20,
"wires": []
},
{
"id": "5b19f46aa91d08fa",
"type": "comment",
"z": "feaffe784243c357",
"name": "Not useful for this discussion, but just assume. =)",
"info": "",
"x": 200,
"y": 60,
"wires": []
},
{
"id": "899b077608b75088",
"type": "comment",
"z": "8d032cedaac7f1a0",
"name": "6502 Status Register Example - NV0BDIZC",
"info": "7 6 5 4 3 2 1 0\nN\tV\t0\tB\tD\tI\tZ\tC\n\nNote: bit 5 in the 6502 processor is always 0.",
"x": 180,
"y": 120,
"wires": []
},
{
"id": "cad8f48bd0537bf2",
"type": "comment",
"z": "8d032cedaac7f1a0",
"name": "007 06 05 04 3 2 1 0",
"info": "",
"x": 120,
"y": 160,
"wires": []
},
{
"id": "c97934b62979bce3",
"type": "comment",
"z": "8d032cedaac7f1a0",
"name": "N- Negative - Set when operation results in a negative value (bit 7 set)",
"info": "N\tV\t0\tB\tD\tI\tZ\tC",
"x": 650,
"y": 200,
"wires": []
},
{
"id": "4ed75f188850972a",
"type": "comment",
"z": "8d032cedaac7f1a0",
"name": "V - Overflow - Set when arithmetic operation or compare results in an overflow value",
"info": "N\tV\t0\tB\tD\tI\tZ\tC",
"x": 690,
"y": 240,
"wires": []
},
{
"id": "a47da15dbb67b1e1",
"type": "comment",
"z": "8d032cedaac7f1a0",
"name": "Bit 5 in the 6502 status register is always 0",
"info": "B - Break - Set when a BRK opcode has been executed, is only written to the stack",
"x": 560,
"y": 280,
"wires": []
},
{
"id": "2829e5b3c22e159f",
"type": "comment",
"z": "8d032cedaac7f1a0",
"name": "B - Break - Set when a BRK opcode has been executed, is only written to the stack",
"info": "N\tV\t0\tB\tD\tI\tZ\tC",
"x": 690,
"y": 320,
"wires": []
},
{
"id": "dbd23ddf469cf8f2",
"type": "comment",
"z": "8d032cedaac7f1a0",
"name": "D - Decimal - Decimal flag",
"info": "Note: The Famicom/NES does not have a decimal mode.",
"x": 510,
"y": 360,
"wires": []
},
{
"id": "e2ce14e8542b7a65",
"type": "comment",
"z": "8d032cedaac7f1a0",
"name": "I - Interrupt - Set to disable interrupts (deprecated)",
"info": "N\tV\t0\tB\tD\tI\tZ\tC",
"x": 590,
"y": 400,
"wires": []
},
{
"id": "e824f0865b7db573",
"type": "comment",
"z": "8d032cedaac7f1a0",
"name": "Z - Zero - Set when operation results in a zero value",
"info": "N\tV\t0\tB\tD\tI\tZ\tC",
"x": 590,
"y": 440,
"wires": []
},
{
"id": "94a304b660ef6277",
"type": "comment",
"z": "8d032cedaac7f1a0",
"name": "C - Carry - Carry for arithmetic operations and compares",
"info": "N\tV\t0\tB\tD\tI\tZ\tC",
"x": 610,
"y": 480,
"wires": []
},
{
"id": "a68ed910727f70c7",
"type": "modbus-write",
"z": "8d032cedaac7f1a0",
"name": "Clear All 1024 Holding Registers",
"showStatusActivities": true,
"showErrors": true,
"showWarnings": true,
"unitid": "1",
"dataType": "MHoldingRegisters",
"adr": "0",
"quantity": "64",
"server": "2dadfc00.5aa6a4",
"emptyMsgOnFail": true,
"keepMsgProperties": true,
"delayOnStart": false,
"startDelayTime": "",
"x": 580,
"y": 140,
"wires": [
[],
[]
]
},
{
"id": "55dc47189521cce8",
"type": "function",
"z": "8d032cedaac7f1a0",
"name": "Get Zeros Array",
"func": "const zerosArray = Array.from({ length: 1024 }, () => 0);\nmsg.payload = zerosArray;\nreturn msg;\n\n",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 590,
"y": 60,
"wires": [
[
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{
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"type": "inject",
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"name": "Inject",
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"repeat": "",
"crontab": "",
"once": true,
"onceDelay": 0.1,
"topic": "",
"x": 580,
"y": 20,
"wires": [
[
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]
},
{
"id": "4f5c393502d9c5ec",
"type": "split",
"z": "8d032cedaac7f1a0",
"name": "Break Into 64-bit Chunks",
"splt": "\\n",
"spltType": "str",
"arraySplt": "64",
"arraySpltType": "len",
"stream": false,
"addname": "",
"x": 580,
"y": 100,
"wires": [
[
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]
},
{
"id": "d90572add7e8296f",
"type": "comment",
"z": "8d032cedaac7f1a0",
"name": "Address 32",
"info": "",
"x": 310,
"y": 180,
"wires": []
},
{
"id": "8c9f09414e1a3f26",
"type": "modbus-read",
"z": "8d032cedaac7f1a0",
"name": "",
"topic": "",
"showStatusActivities": true,
"logIOActivities": false,
"showErrors": true,
"showWarnings": true,
"unitid": "1",
"dataType": "HoldingRegister",
"adr": "32",
"quantity": "1",
"rate": "1",
"rateUnit": "s",
"delayOnStart": false,
"startDelayTime": "",
"server": "2dadfc00.5aa6a4",
"useIOFile": false,
"ioFile": "",
"useIOForPayload": false,
"emptyMsgOnFail": true,
"x": 110,
"y": 440,
"wires": [
[],
[
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},
{
"id": "ce22ce8dcc4ceda0",
"type": "debug",
"z": "8d032cedaac7f1a0",
"name": "Debug",
"active": true,
"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "payload.data",
"targetType": "msg",
"statusVal": "",
"statusType": "auto",
"x": 190,
"y": 500,
"wires": []
},
{
"id": "a9249ca858f669ee",
"type": "comment",
"z": "8d032cedaac7f1a0",
"name": "Read from PLC using Modbus Client",
"info": "",
"x": 160,
"y": 400,
"wires": []
},
{
"id": "42a2c20cba9e037a",
"type": "inject",
"z": "8d032cedaac7f1a0",
"name": "Set Bits",
"props": [
{
"p": "payload"
}
],
"repeat": "2",
"crontab": "",
"once": true,
"onceDelay": "2",
"topic": "",
"payload": "129",
"payloadType": "num",
"x": 100,
"y": 300,
"wires": [
[
"d8093ac257c16bf0"
]
]
},
{
"id": "d8093ac257c16bf0",
"type": "modbus-write",
"z": "8d032cedaac7f1a0",
"name": "Set the C to 1, Z to 0, N to 1",
"showStatusActivities": true,
"showErrors": true,
"showWarnings": true,
"unitid": "1",
"dataType": "HoldingRegister",
"adr": "32",
"quantity": "1",
"server": "2dadfc00.5aa6a4",
"emptyMsgOnFail": true,
"keepMsgProperties": true,
"delayOnStart": false,
"startDelayTime": "",
"x": 160,
"y": 340,
"wires": [
[],
[]
]
},
{
"id": "5e481a1c8173ef4c",
"type": "function",
"z": "8d032cedaac7f1a0",
"name": "Get Values",
"func": "const value = (msg.payload.data & 0xFFFF)\nconst data = value.toString(2).padStart(16, '0');\nmsg.payload = { data };\nreturn msg;",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 290,
"y": 440,
"wires": [
[
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]
]
},
{
"id": "b1b848ab4747951a",
"type": "inject",
"z": "8d032cedaac7f1a0",
"name": "Default",
"props": [
{
"p": "payload"
}
],
"repeat": "2",
"crontab": "",
"once": true,
"onceDelay": "1",
"topic": "",
"payload": "2",
"payloadType": "num",
"x": 100,
"y": 240,
"wires": [
[
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]
]
},
{
"id": "fcd042c80d2327eb",
"type": "modbus-write",
"z": "8d032cedaac7f1a0",
"name": "Reset Status Register",
"showStatusActivities": true,
"showErrors": true,
"showWarnings": true,
"unitid": "1",
"dataType": "HoldingRegister",
"adr": "32",
"quantity": "1",
"server": "2dadfc00.5aa6a4",
"emptyMsgOnFail": true,
"keepMsgProperties": true,
"delayOnStart": false,
"startDelayTime": "",
"x": 280,
"y": 260,
"wires": [
[],
[]
]
},
{
"id": "083a31158fb87418",
"type": "comment",
"z": "8d032cedaac7f1a0",
"name": "The 6502 follows a little-endian byte ordering.",
"info": "",
"x": 180,
"y": 20,
"wires": []
},
{
"id": "c61aea0b448c6e2b",
"type": "comment",
"z": "8d032cedaac7f1a0",
"name": "128 64 32 16 8 4 2 1",
"info": "",
"x": 120,
"y": 200,
"wires": []
},
{
"id": "bda3446a1fd595b9",
"type": "comment",
"z": "7eb2d70e8ea91d6d",
"name": "6502 Status Register Example - NV0BDIZC",
"info": "7 6 5 4 3 2 1 0\nN\tV\t0\tB\tD\tI\tZ\tC\n\nNote: bit 5 in the 6502 processor is always 0.",
"x": 190,
"y": 160,
"wires": []
},
{
"id": "e39dcdff240959d4",
"type": "comment",
"z": "7eb2d70e8ea91d6d",
"name": "7 6 5 4 3 2 1 0",
"info": "",
"x": 90,
"y": 200,
"wires": []
},
{
"id": "fdf1a0619fa43cfa",
"type": "comment",
"z": "7eb2d70e8ea91d6d",
"name": "N- Negative - Set when operation results in a negative value (bit 7 set)",
"info": "N\tV\t0\tB\tD\tI\tZ\tC",
"x": 650,
"y": 200,
"wires": []
},
{
"id": "f3fd8705ad7dccfc",
"type": "comment",
"z": "7eb2d70e8ea91d6d",
"name": "V - Overflow - Set when arithmetic operation or compare results in an overflow value",
"info": "N\tV\t0\tB\tD\tI\tZ\tC",
"x": 690,
"y": 240,
"wires": []
},
{
"id": "c5c41803d9f24134",
"type": "comment",
"z": "7eb2d70e8ea91d6d",
"name": "Bit 5 in the 6502 status register is always 0",
"info": "B - Break - Set when a BRK opcode has been executed, is only written to the stack",
"x": 560,
"y": 280,
"wires": []
},
{
"id": "a690d73acb3353fe",
"type": "comment",
"z": "7eb2d70e8ea91d6d",
"name": "B - Break - Set when a BRK opcode has been executed, is only written to the stack",
"info": "N\tV\t0\tB\tD\tI\tZ\tC",
"x": 690,
"y": 320,
"wires": []
},
{
"id": "cef4523e48a56ce8",
"type": "comment",
"z": "7eb2d70e8ea91d6d",
"name": "D - Decimal - Decimal flag",
"info": "Note: The Famicom/NES does not have a decimal mode.",
"x": 510,
"y": 360,
"wires": []
},
{
"id": "b1c5ea5c05631628",
"type": "comment",
"z": "7eb2d70e8ea91d6d",
"name": "I - Interrupt - Set to disable interrupts (deprecated)",
"info": "N\tV\t0\tB\tD\tI\tZ\tC",
"x": 590,
"y": 400,
"wires": []
},
{
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"type": "comment",
"z": "7eb2d70e8ea91d6d",
"name": "Z - Zero - Set when operation results in a zero value",
"info": "N\tV\t0\tB\tD\tI\tZ\tC",
"x": 590,
"y": 440,
"wires": []
},
{
"id": "73682fca895b5ea6",
"type": "comment",
"z": "7eb2d70e8ea91d6d",
"name": "C - Carry - Carry for arithmetic operations and compares",
"info": "N\tV\t0\tB\tD\tI\tZ\tC",
"x": 600,
"y": 480,
"wires": []
},
{
"id": "52bffe25abe81084",
"type": "modbus-write",
"z": "7eb2d70e8ea91d6d",
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"showErrors": true,
"showWarnings": true,
"unitid": "1",
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"adr": "0",
"quantity": "64",
"server": "2dadfc00.5aa6a4",
"emptyMsgOnFail": true,
"keepMsgProperties": true,
"delayOnStart": false,
"startDelayTime": "",
"x": 590,
"y": 140,
"wires": [
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[]
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},
{
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"type": "function",
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"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 600,
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"wires": [
[
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},
{
"id": "b98e77e605c4b44c",
"type": "inject",
"z": "7eb2d70e8ea91d6d",
"name": "Inject",
"props": [],
"repeat": "",
"crontab": "",
"once": true,
"onceDelay": 0.1,
"topic": "",
"x": 590,
"y": 20,
"wires": [
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},
{
"id": "9c166fec984f998d",
"type": "split",
"z": "7eb2d70e8ea91d6d",
"name": "Break Into 64-bit Chunks",
"splt": "\\n",
"spltType": "str",
"arraySplt": "64",
"arraySpltType": "len",
"stream": false,
"addname": "",
"x": 590,
"y": 100,
"wires": [
[
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]
},
{
"id": "6e9a2979b1b15296",
"type": "comment",
"z": "7eb2d70e8ea91d6d",
"name": "Address 33 through 40",
"info": "",
"x": 280,
"y": 200,
"wires": []
},
{
"id": "74d620e0f95ca639",
"type": "modbus-read",
"z": "7eb2d70e8ea91d6d",
"name": "",
"topic": "",
"showStatusActivities": true,
"logIOActivities": false,
"showErrors": true,
"showWarnings": true,
"unitid": "1",
"dataType": "HoldingRegister",
"adr": "33",
"quantity": "8",
"rate": "1",
"rateUnit": "s",
"delayOnStart": false,
"startDelayTime": "",
"server": "2dadfc00.5aa6a4",
"useIOFile": false,
"ioFile": "",
"useIOForPayload": false,
"emptyMsgOnFail": true,
"x": 110,
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"wires": [
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[
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{
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"z": "7eb2d70e8ea91d6d",
"name": "Debug",
"active": true,
"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "payload.data",
"targetType": "msg",
"statusVal": "",
"statusType": "auto",
"x": 390,
"y": 520,
"wires": []
},
{
"id": "a3a8d5e07e2e3711",
"type": "comment",
"z": "7eb2d70e8ea91d6d",
"name": "Read from PLC using Modbus Client",
"info": "",
"x": 160,
"y": 520,
"wires": []
},
{
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"type": "inject",
"z": "7eb2d70e8ea91d6d",
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}
],
"repeat": "2",
"crontab": "",
"once": true,
"onceDelay": "2",
"topic": "",
"payload": "[1]",
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"x": 250,
"y": 300,
"wires": [
[
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},
{
"id": "0190991ec4347e7f",
"type": "modbus-write",
"z": "7eb2d70e8ea91d6d",
"name": "Set the Carry flag (C) to 1",
"showStatusActivities": true,
"showErrors": true,
"showWarnings": true,
"unitid": "1",
"dataType": "HoldingRegister",
"adr": "40",
"quantity": "1",
"server": "2dadfc00.5aa6a4",
"emptyMsgOnFail": true,
"keepMsgProperties": true,
"delayOnStart": false,
"startDelayTime": "",
"x": 250,
"y": 340,
"wires": [
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[]
]
},
{
"id": "ebe4458438558463",
"type": "modbus-write",
"z": "7eb2d70e8ea91d6d",
"name": "Set the Zero flag (Z) to 0",
"showStatusActivities": true,
"showErrors": true,
"showWarnings": true,
"unitid": "1",
"dataType": "HoldingRegister",
"adr": "39",
"quantity": "1",
"server": "2dadfc00.5aa6a4",
"emptyMsgOnFail": true,
"keepMsgProperties": true,
"delayOnStart": false,
"startDelayTime": "",
"x": 250,
"y": 400,
"wires": [
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[]
]
},
{
"id": "a61fb5bd4563391e",
"type": "modbus-write",
"z": "7eb2d70e8ea91d6d",
"name": "Set the Negative flag (N) to 1",
"showStatusActivities": true,
"showErrors": true,
"showWarnings": true,
"unitid": "1",
"dataType": "HoldingRegister",
"adr": "33",
"quantity": "1",
"server": "2dadfc00.5aa6a4",
"emptyMsgOnFail": true,
"keepMsgProperties": true,
"delayOnStart": false,
"startDelayTime": "",
"x": 260,
"y": 460,
"wires": [
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[]
]
},
{
"id": "1308189fb266f1d1",
"type": "inject",
"z": "7eb2d70e8ea91d6d",
"name": "0",
"props": [
{
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}
],
"repeat": "2",
"crontab": "",
"once": true,
"onceDelay": "2",
"topic": "",
"payload": "[0]",
"payloadType": "json",
"x": 90,
"y": 300,
"wires": [
[
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]
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{
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"type": "function",
"z": "7eb2d70e8ea91d6d",
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"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 290,
"y": 580,
"wires": [
[
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},
{
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"type": "inject",
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"name": "Default",
"props": [
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}
],
"repeat": "2",
"crontab": "",
"once": true,
"onceDelay": "1",
"topic": "",
"payload": "[0, 0, 0, 0, 0, 0, 1, 0]",
"payloadType": "json",
"x": 100,
"y": 240,
"wires": [
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{
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"z": "7eb2d70e8ea91d6d",
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"showStatusActivities": true,
"showErrors": true,
"showWarnings": true,
"unitid": "1",
"dataType": "MHoldingRegisters",
"adr": "33",
"quantity": "8",
"server": "2dadfc00.5aa6a4",
"emptyMsgOnFail": true,
"keepMsgProperties": true,
"delayOnStart": false,
"startDelayTime": "",
"x": 280,
"y": 240,
"wires": [
[],
[]
]
},
{
"id": "0c162c06ef6db153",
"type": "comment",
"z": "7eb2d70e8ea91d6d",
"name": "The 6502 follows a little-endian byte ordering. It's important to note",
"info": "",
"x": 260,
"y": 20,
"wires": []
},
{
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"type": "comment",
"z": "7eb2d70e8ea91d6d",
"name": "in this example, we are simulating an 8-bit register by assigning ",
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"x": 250,
"y": 60,
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},
{
"id": "ae1286b7b1483d9f",
"type": "comment",
"z": "7eb2d70e8ea91d6d",
"name": "8 addresses as if they represent individual bits.",
"info": "",
"x": 200,
"y": 100,
"wires": []
}
]
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