Outline - Omron E5AN User Manual

CHAPTER 1 ABOUT COMMUNICATIONS METHODS

1.1 Outline

J Introduction
J Communications specifications
1--2
The program for the communications functions are created on the host
computer, and the E5AN/EN/CN/GN's parameters are monitored or set
from the host computer. Therefore, the description provided here is from
the viewpoint of the host computer.
CompoWay/F is OMRON's standard communications format for general
serial communications. This format uses a standard frame format as well
as the FINS* commands which have proven successful in OMRON's PLCs.
Therefore, it can simplify communications between components and the
host computer.
* FINS (Factory Interface Network Service)
The FINS protocol provides message communications between control-
lers in OMRON FA networks.
The E5AN/EN/CN/GN have 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).
Transmission line connection RS-485 : Multiple point
Communications method
Synchronization method
Baud rate
*2
Communication code
*2
Data bits
*2
Stop bits
Error detection
Flow control
*1
Interface
Retry function
Communications buffer
*1 RS-232C is only available with the E5AN/EN.
*2 Communications speed, data bits, stop bits and vertical parity can each
be set independently in the communications setting level. Highlighted
characters in the table above indicate defaults.
RS-232C : Point to point
*1
RS-485 (2-wire, half-duplex)
RS-232C
Start-stop synchronization
1200, 2400, 4800, 9600, 19200 bps
ASCII
7 or 8 bits
1 or 2 bits
Vertical parity (non, even, or odd)
FCS (frame check sequence) during Sysway com-
munications
BCC (block check character) during CompoWay/F
communications
None
RS-485/RS-232C
None
40 byte