Omron E5EK, User Manual

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CHAPTER 6 USING THE COMMUNICATIONS FUNCTION
E5EK
6--2
6.1 Outline of the Communications Function
The communications function allows you to monitor and set E5EK-T
parameters by a program prepared and running on a host computer
connected to the E5EK-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 E5EK-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 Command frame
Response frame
Host computer
E5EK-T
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
E5-AK01: RS-232C
E5-AK02: RS-422
E5-AK03: RS-485
J
Outline
J
Transfer
procedure
J
Interface