8-1
Chapter 8. Modbus Communication Function
8 - 1 Overview of Communications
If a model with RS-485 communication is used, this device can communicate with a PC, PLC or other host device
using a program created by the user.
CPL (Controller Peripheral Link: Azbil Corporation's host communication protocol) or MODBUS can be selected as
the communication protocol. This chapter describes MODBUS communications.
Features
Key features of the C1M’s communication functions are as follows:
• Up to 31 C1M units can be connected to a single master station (host device).
• Almost all of the parameter data of this device can be communicated.
Chapter 10. List of Communication Data
Handling Precautions:
• In MODBUS communications, the data address of this device that is set in
the host device may be reduced by 1 in a communication message during
transmission. Be sure to understand the specifications of the host device
before using this device.
Example: If the data address is set to 1001 in the host device, it will be 1000 in
a communication message during transmission.
Configuration
The settings shown below must be specified for Modbus communication.
Item Display Description Initial
value
User level
Communication type
C 64
0: CPL
1: Modbus/ASCII
2: Modbus/RTU
3: PLC link
0 Simple,
standard,
advanced
Station address
C 65
0: No communication
1 to 127
0
Transmission speed
C 66
0: 4800 bps
1: 9600 bps
2: 19200 bps
3: 38400 bps
2
Data format (data
length)
C 67
0: 7 bits
1: 8 bits
1
Data format (parity)
C 68
0: Even parity
1: Odd parity
2: No parity
0
Data format (stop bit)
C 69
0: 1 bit
1: 2 bits
0
Communication
minimum response time
C 70
1 to 250 ms 3 Advanced
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