1 Communications Methods
1 - 2
E5@D Digital Temperature Controllers Communications Manual (H225)
1-1
Overview of Communications
Methods
The program for the communications functions is created on the host (personal computer, PLC, or
other type of communications master), and the E5
@
D'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 Schnei-
der Electric.
It supports functions equivalent to the CompoWay/F Read Variable Area, Write Variable Area, Opera-
tion Command, and Echoback Test functions.
The E5
@
D 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).
1-1-1
Introduction
1-1-2
Communications Specifications
Transmission line connection
RS-485: Multidrop
Communications method
RS-485 (2-wire, half-duplex)
Synchronization method
Start-stop synchronization
Communications baud rate *1
9,600, 19,200, 38,400, 57,600, or 115,200 bps
Communications code
ASCII
Communications data length *1
7 or 8 bits
Communications stop bits *1
1 or 2 bits
Error detection
Vertical parity (none, even, or odd) *1
•
With CompoWay/F
Block Check Character (BCC)
•
With Modbus
CRC-16 (Cyclic Redundancy Check 16)
Flow control
None
Interface
RS-485
Retry function
None
Communications buffer
217 bytes
Send data wait time
0 to 99 ms, default time: 20 ms
Содержание E5 D Series
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