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Communication with PLC devices by the IDEC company

The IDEC Corporation company (http://www.idec.com, Japan) manufactures PLC devices of the following types:
- SmartAxis
- MicroSmart (e.g. FC6A etc.)
- Micro-3, Micro-1, FA2J, FA3S (older device types)


in the PROMOTIC application, it is possible to use following ways to communnicate with these devices:

Communication by the Modbus protocol

For this communication in the PROMOTIC system can be used:
- For example SmartAxis PLC supports:
- Modbus RTU: on expansion comm port.
- Modbus TCP/IP: in built-in Ethernet port.
- Modbus address IDEC is represented by a six digit number (e.g. Holding register 400001). The Modbus protocol does not support such high adresses and therefore recalculation is necessary:
From 6-digit decimal address only last 4 digits are taken and 1 is subtracted (e.g. Holding register 400016 will have the decimal communication address 15).
In this case the values in the "PmaCommGroup > Parameters > Special Parameters > Area base addresses" configurator must be set to 0.
- The data can be read/written by the following Modbus functions:
- Functions for reading:
01-Read Coil Status (Read Output Bits)
02-Read Input Status (Read Input Bits)
03-Read Holding Registers (Read Output Registers)
04-Read Input Registers
- Functions for writing:
05-Force Single Coil (Write 1 Bit)
15-Force Multiple Coils (Write n Bits)
16-Preset Multiple Registers (Write n Registers)


Communication by the ASCII protocol

For this communication in the PROMOTIC system can be used:

History:
Pm8.03.08: Created
PROMOTIC 9.0.17 SCADA system documentation - MICROSYS, spol. s r.o.

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