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12 Modbus
12.1 Setting of MODBUS TOPIC
All of the following examples are applied to WONDERWARE MODICON MODBUS I/O
SERVER
- MAX COIL READ COUNT : 8
- MAX COIL WRITE COUNT : 8
- MAX REGISTER READ COUNT : 8
- MAX REGISTAER WRITECOUNT : 8
12.2 ITEM/POINT NAME
12.2.1 SIGNED REGISTER
It has a value of decimal 0 ~ 65535 range when WONDERWARE MODICON MODBUS
I/O SERVER is used. It has a name of "REGISTER_NAME"+ " "+ "S" when its data type is
signed integer.
Example) 3001 :UNSIGNED REGISTER (0 ~ 65535)
Example) 3001 S :SIGNED REGISTER (-32,768 ~ 32767)
12.2.2 LONG INTEGER
It consists of two registers and is type of 32BIT-SIGNED INTEGER. Its name is
"REGISTER_NAME" + " " + "L
Example)30001 L :30001 and 30002 are used
12.2.3 FLOATING POINT
It consists of two registers and is type of IEEE 32 Bit Floating Point Number. Its name is
"REGISTER_NAME" + " " + "F
Example) 30001 F :30001and 30002are used.
12.2.4 BIT IN REGISTER
Following Examples are applied
Example)30001:1 : MSB(MOST SIGNIFICANT BIT) of INPUT REGISTER
Example)30008:16 : LSB(LEAST SIGNIFICANT BIT) of INPUT REGISTER
* Two of the most significant bytes and the list significant bytes in float-pointing data