S7与PLC-1200/1500通讯

说明: 作者： Super User; 分类：Uncategorised; 日期：2022年9月14日; 点击数：897

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protection /permit access with PUT/GET

Address	Step7 equivalent	JS Data type	Description
`DB5,X0.1`	`DB5.DBX0.1`	Boolean	Bit 1 of byte 0 of DB 5
`DB23,B1` or `DB23,BYTE1`	`DB23.DBB1`	Number	Byte 1 (0-255) of DB 23
`DB100,C2` or `DB100,CHAR2`	`DB100.DBB2`	String	Byte 2 of DB 100 as a Char
`DB42,I3` or `DB42,INT3`	`DB42.DBW3`	Number	Signed 16-bit number at byte 3 of DB 42
`DB57,WORD4`	`DB57.DBW4`	Number	Unsigned 16-bit number at byte 4 of DB 57
`DB13,DI5` or `DB13,DINT5`	`DB13.DBD5`	Number	Signed 32-bit number at byte 5 of DB 13
`DB19,DW6` or `DB19,DWORD6`	`DB19.DBD6`	Number	Unsigned 32-bit number at byte 6 of DB 19
`DB21,R7` or `DB21,REAL7`	`DB21.DBD7`	Number	Floating point 32-bit number at byte 7 of DB 21
`DB2,S7.10`*	-	String	String of length 10 starting at byte 7 of DB 2
`I1.0` or `E1.0`	`I1.0` or `E1.0`	Boolean	Bit 0 of byte 1 of input area
`Q2.1` or `A2.1`	`Q2.1` or `A2.1`	Boolean	Bit 1 of byte 2 of output area
`M3.2`	`M3.2`	Boolean	Bit 2 of byte 3 of memory area
`IB4` or `EB4`	`IB4` or `EB4`	Number	Byte 4 (0 -255) of input area
`QB5` or `AB5`	`QB5` or `AB5`	Number	Byte 5 (0 -255) of output area
`MB6`	`MB6`	Number	Byte 6 (0 -255) of memory area
`IC7` or `EC7`	`IB7` or `EB7`	String	Byte 7 of input area as a Char
`QC8` or `AC8`	`QB8` or `AB8`	String	Byte 8 of output area as a Char
`MC9`	`MB9`	String	Byte 9 of memory area as a Char
`II10` or `EI10`	`IW10` or `EW10`	Number	Signed 16-bit number at byte 10 of input area
`QI12` or `AI12`	`QW12` or `AW12`	Number	Signed 16-bit number at byte 12 of output area
`MI14`	`MW14`	Number	Signed 16-bit number at byte 14 of memory area
`IW16` or `EW16`	`IW16` or `EW16`	Number	Unsigned 16-bit number at byte 16 of input area
`QW18` or `AW18`	`QW18` or `AW18`	Number	Unsigned 16-bit number at byte 18 of output area
`MW20`	`MW20`	Number	Unsigned 16-bit number at byte 20 of memory area
`IDI22` or `EDI22`	`ID22` or `ED22`	Number	Signed 32-bit number at byte 22 of input area
`QDI24` or `ADI24`	`QD24` or `AD24`	Number	Signed 32-bit number at byte 24 of output area
`MDI26`	`MD26`	Number	Signed 32-bit number at byte 26 of memory area
`ID28` or `ED28`	`ID28` or `ED28`	Number	Unsigned 32-bit number at byte 28 of input area
`QD30` or `AD30`	`QD30` or `AD30`	Number	Unsigned 32-bit number at byte 30 of output area
`MD32`	`MD32`	Number	Unsigned 32-bit number at byte 32 of memory area
`IR34` or `ER34`	`IR34` or `ER34`	Number	Floating point 32-bit number at byte 34 of input area
`QR36` or `AR36`	`QR36` or `AR36`	Number	Floating point 32-bit number at byte 36 of output area
`MR38`	`MR38`	Number	Floating point 32-bit number at byte 38 of memory area
`DB1,DT0`	-	Date**	A timestamp in the DATE_AND_TIME format
`DB1,DTZ10`	-	Date**	A timestamp in the DATE_AND_TIME format, in UTC
`DB2,DTL2`	-	Date**	A timestamp in the DTL format
`DB2,DTLZ12`	-	Date**	A timestamp in the DTL format, in UTC
`DB57,RWORD4`	`DB57.DBW4`	Number	Unsigned 16-bit number at byte 4 of DB 57, interpreted as Little-Endian
`DB13,RDI5` or `DB13,RDINT5`	`DB13.DBD5`	Number	Signed 32-bit number at byte 5 of DB 13, interpreted as Little-Endian
`MRW20`	`MW20`	Number	Unsigned 16-bit number at byte 20 of memory area, interpreted as Little-Endian

*) Note that strings on the PLC uses 2 extra bytes at start for size/length of the string
**) Note that javascript's Date are always represented in UTC. Please use other nodes like node-red-contrib-moment to properly handle type conversions

S7与PLC-1200/1500通讯

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