| The serial drivers PCxI, MCxI, COMxI or
COMx may be used.
Setup the PLC with the appropriate communication parameters i.e.
baud rate, parity, protocol and station number. e.g 9600 baud, EVEN
parity, 8 data bits, 1 stop bits, RTU mode and Modbus Port address
1.
| I/O Devices
form
|
|
| Name: |
User supplied unique
name
|
| Number: |
Network wide I/O
device number
|
| Address: |
PLC unit number
starting from 1
|
| Protocol: |
MODBUS |
| Port name: |
Use the "Port
name" from the Ports form |
Citect.ini option
[MBPLUS]
StringReverse = 0
Do not reverse bytes in words of strings.
MaxBits = 2000 (bits)
Maximum number of bits that can be read in one request.
Pad = 0
Send this number of PadChar at the beginning of each request.
PadChar = 255
Value of PadChar.
Standard citect.ini options
[MODBUS]
MaxPending = 2
Block = 50 bytes
Retry = 2
Delay = 0
TimeOut = 4000 milliseconds
PollTime = 0
WatchTime = 30 seconds
Files
- MODBUS.DLL - The MODBUS driver for windows
- MODBUS.DBF - The MODBUS variable template
MODBUS Variables
| Digital
|
|
|
00001
|
Output Coils 1 to
99999
|
|
|
10001
|
Input status 1 to
99999
|
| Integer/Long/Real/String
|
|
|
30001
|
Input registers 1 to
99999
|
|
|
40001
|
Output registers 1 to
99999
|
|
