Yamatake SDC35, Руководство пользователя

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Chapter 8. MODBUS COMMUNICATION FUNCTION
8 - 1 Outline of Communication
8-1
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
(Yamatake's host communication protocol) and the MODBUS communication. This chapter describes the
MODBUS communications.
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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.
• When the communication specifications of the host device conform to the RS-
232C interface, the communication converter CMC10L (sold separately) is
required. The CMC10L allows the conversion between RS-232C and RS-485.
• Almost all of the device parameters can be communicated.
For details on communication parameters, refer to;
Chapter 9, LIST OF COMMUNICATION DATA .
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Setup
The following setups are required for performing the MODBUS communication:
• 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.
• If you use the Yamatake CMC10L as an RS-232C/RS-485 converter,
set the response time-out (C70) to 3ms or longer.
Item Display Contents Initial User
(Setting display/bank) value level
CPL/MODBUS 0: CPL 0 Basic,
(Setup setting/Setup bank) 1: MODBUS ASCII format Standard,
2: MODBUS RTU format High
Station address 0: Does not communicate 0
function
(Same as above) 1 to 127
Transmission speed 0: 4800bps 2
(Same as above) 1: 9600bps
2: 19200bps
3: 38400bps
Data format (Data length) 0: 7 bits 1
(Same as above) 1: 8 bits
Data format (Parity) 0: Even parity 0
(Same as above) 1: Odd parity
2: No parity
Data format (Stop bit) 0: 1 stop bit 0
(Same as above) 1: 2 stop bits
Response time-out 1 to 250ms 3 High
function