Omron ZEN Communications Manual

1.1 Overview of Communications Methods
3
Overview
■ Transmission Procedure
When the host computer transmits a command frame, the ZEN
transmits a response frame that corresponds to the command frame. A
single response frame is returned for each command frame. The
following diagram shows the operation of the command and response
frames.
Note: Allow a wait time of at least 2 ms before the next command is
sent after the host computer receives a response from the ZEN.
■ Interface
Use of the following Converter for RS-232C and RS-485 interface
conversion is recommended.
■ Wiring
This section explains how to perform the ZEN’s communications wiring.
For details on the host computer, refer to the user documentation
provided with the host computer.
• Match the communications specifications of the ZEN and the host
computer.
• The connection format can be either one-to-one or one-to-N.
• Up to 32 units including the host computer can be connected in a one-
to-N system.
• The total cable length is 500 m max.
• Use a shielded twisted-pair cable with wires of a thickness of AWG28 to
AWG14 for communications signal wiring.
Note: When using a 1:N connection, set the same communications
specifications in all of the Units, and set a unique node number
for each Unit.
ZEN
Command frame
Command frame
Response frame
Host computer
Name Model Details
Interface Con-
verter (OMRON)
K3SC Communications between the host computer
and the ZEN conform to the RS-485 interface.

Omron ZEN Specifications

General

Display	LCD
Mounting Type	DIN Rail
Operating Temperature	-10 to 55°C
Power Supply Voltage	100-240V AC
Output Type	Relay, Transistor
Number of Outputs	4-8
Programming Language	Ladder Logic