Outline Of The Communications Function; Outline; Interface - Omron e5ck User Manual

CHAPTER 6 USING THE COMMUNICATIONS FUNCTION

6.1 Outline of the Communications Function

JOutline
JTransfer
procedure
Host computer
E5CK-T
JInterface
6–2
The communications function allows you to monitor and set E5CK T pa
rameters by a program prepared and running on a host computer con
nected to the E5CK T controller. This chapter describes operations as
viewed from the host computer.
When the communications function is used, the E53 CK01/03 commu
nications unit must be added on.
The E5CK T communications function allows you to carry out the follow
ing:
• 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 op
tion 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, and RS 485 specifications are as fol
lows:
• Option units
E5 CK01: RS 232C
E5 CK03: RS 485
Command frame
Response frame