Chapter 6 Using The Communications Function; Outline Of The Communications Function; Transfer Procedure - Omron E5AK PROGRAMMABLE TYPE User Manual

CHAPTER 6 USING THE COMMUNICATIONS FUNCTION

6.1 Outline of the Communications Function

J Outline
J Transfer
procedure
Host computer
E5AK-T
J Interface
6--2
The communications function allows you to monitor and set E5AK-T
parameters by a program prepared and running on a host computer
connected to the E5AK-T controller. This chapter describes operations
as viewed from the host computer.
When the communications function is used, the E53-AK01/02/03 com-
munications unit must be added on.
The E5AK-T communications function allows you to carry out the fol-
lowing:
• Read/write parameters
• Instruct operations
• Select the setting level.
The communications function assumes the following conditions:
• Writing of parameters is possible only during remote operation. Also,
parameters cannot be written during execution of auto-tuning.
• Writing of parameters is limited by setting level. Writing conditions
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.
• The "remote/local", "AT execute/cancel", "hold/hold cancel" and
"advance" parameters are set aside from other parameters as special
commands for instructing 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.
Controllers supporting the RS-232C, RS-422 and RS-485 specifications
are as follows:
• Option units
E53-AK01: RS-232C
E53-AK02: RS-422
E53-AK03: RS-485
Command frame
Response frame