Azbil SDC36 - Chapter 8. Modbus COMMUNICATION FUNCTION; 8-1 Outline of Communication

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.