Outline Of The Communications Function; Interface; Transfer Procedure - Omron E5AK User Manual

CHAPTER 6 USING THE COMMUNICATIONS FUNCTION

6.1 Outline of the Communications Function

J Outline
J Transfer
procedure
Host computer
E5AK
J Interface
6--2
The communications function allows you to monitor and set E5AK
parameters by a program prepared and running on a host computer
connected to the E5AK controller. This chapter describes operations as
viewed from the host computer.
When using the communications function, the option unit for RS-232C,
RS-422 or RS-485 communications must be added on. The E5AK com-
munications function allows you to carry out the following:
• Reading/writing of parameters;
• Operation instructions; and
• Selecting the setting level.
The communications function assumes the following conditions:
• Writing of parameters is possible in during remote operation. Also,
parameters cannot be written during execution of auto-tuning;
• Writing parameters are provided with a setting level. Writing condi-
tions are as follows depending on the setting level:
Setting level 1: No restrictions
Setting level 0: Writing of parameters in the setup, expansion and
option modes only is prohibited.
• For details on switching between setting levels, see page 6-11.
• The "run/stop", "remote/local" and "AT execute/cancel" parameters
are set aside from other parameters as special commands for instruct-
ing operations.
The host computer sends a "command frame" to the controller, and the
controller returns a "response frame" corresponding to the content of
the command sent by the host computer. In other words, a response
frame is returned for each command frame sent.
The following diagram shows command frame/response frame opera-
tions.
Command frame
The host computer carries out communications conforming to the
RS-232C, RS-422 or RS-485 interface specifications.
Option units supporting the RS-232C, RS-422 and RS-485 specifica-
tions are as follows:
• Option units
E53-AK01 (RS-232C)
E53-AK02 (RS-422)
E53-AK03 (RS-485)
Command frame
Response frame