Overview Of Communications Methods; Introduction; Communications Specifications - Omron E5C-T Series Communications Manual

1 Communications Methods
1-1 Overview of Communications
Methods
1-1-1

Introduction

The program for the communications functions is created on the host (personal computer, PLC, or other
type of communications master), and the E5@C-T's parameters are monitored or set from the host.
Therefore, the description provided here is from the viewpoint of the host.
CompoWay/F is OMRON's standard communications format for general serial communications. This
format uses a standard frame format as well as the well-established FINS* commands used for
OMRON's PLCs. Therefore, it can simplify communications between components and the host.
* FINS (Factory Interface Network service)
The FINS protocol provides message communications between controllers in OMRON FA networks.
Modbus is a standard communications control method that conforms to the Modicon Company's
RTU-mode Modbus Protocol (PI-MBUS-300 Revision J). Modbus is a registered trademark of
Schneider Electric.
It supports functions equivalent to the CompoWay/F Read Variable Area, Write Variable Area, Opera-
tion Command, and Echoback Test functions.
The E5@C-T supports the following communications functions.
• Reading/writing of parameters
• Operation instructions
• Selection of setup levels
Communications are subject to the following condition:
• Parameters can be written only when the Communications Writing parameter is set to ON (enabled).
1-1-2

Communications Specifications

Transmission line connection
Communications method
Synchronization method
Communications baud rate *
Communications code
Communications data length *
Communications stop bits *
Error detection
Flow control
Interface
Retry function
Communications buffer
Send data wait time
* Communications baud rate, data length, stop bits and vertical parity can each be set independently in the
communications setting level. Highlighted values indicate default settings.
1 - 2
RS-485: Multidrop
RS-485 (2-wire, half-duplex)
Start-stop synchronization
9,600, 19,200, 38,400 or 57,600 bps
ASCII
7 or 8 bits
1 or 2 bits
Vertical parity (none, even, or odd) *
BCC (Block Check Character) with CompoWay/F communications
CRC-16 (Cyclic Redundancy Check 16) with Modbus
communications
None
RS-485
None
217 bytes
0 to 99 ms, default time: 20 ms
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