8-1
Chapter 8. Modbus COMMUNICATION FUNCTION
8 - 1 Outline of Communication
If the optional model is provided with the RS-485 communications function, communication with a PC, PLC or
other host devices are available using a user-configured program.
The communication protocol can be selected from the Controller Peripheral Link (CPL) communication (Azbil
Corporation's host communication protocol) and the Modbus communication. This chapter describes the Modbus
communications.
Features
The features of the C35/36's communication function are as follows:
• Up to 31 units can be connected to a single master station as a host device.
• Almost all of the device parameters can be communicated.
For details on communication parameters,
Chapter 9. LIST OF COMMUNICATION DATA.
Setup
The following setups are required for performing the Modbus communication:
Item
(Setting display/bank)
Display Contents Initial
value
User
level
Communication type
(Setup setting/Setup
bank)
0: CPL
1: Modbus ASCII format
2: Modbus RTU format
0 Basic,
Standard,
High
function
Station address
(Same as above)
0: Does not communicate
1 to 127
0
Transmission speed
(Same as above)
0: 4800 bps
1: 9600 bps
2: 19200 bps
3: 38400 bps
2
Data format (Data length)
(Same as above)
0: 7 bits
1: 8 bits
1
Data format (Parity)
(Same as above)
0: Even parity
1: Odd parity
2: No parity
0
Data format (Stop bit)
(Same as above)
0: 1 stop bit
1: 2 stop bits
0
Response time-out
1 to 250 ms 3
High function
• If the optional model number is provided with the RS-485 communications
function, display and setup are available.
• If the communications type is set to Modbus RTU format, data format (data
length) cannot be displayed nor set up, and the action is fixed to 8-bit data.
Handling Precautions
• Setups can be performed through key operation on the console or the
SLP-C35 Smart Loader Package. However, they cannot be performed via
RS-485 communications.
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