LINK Systems OmniLink - PLC Interface - Manual (Page 29)

June 5, 2000 Man ual Rev 1 .0
5.2
“Standard Numeric” in this document.
Values that include decimal points are, by default, sent without the decimal point. For example 123.456
would be sent as 000123456. Decimal points can be sent by setting “Send Decimal Point” to “Yes” in
the Main PLC Configuration Screen. 123.456 would then be sent as 000123.456.
Section 5.4 Text Value Formats
In order to keep the protocol as simple as possible for the PLC to handle, a fixed text format is
employed. All parameters that return text (Job Description, Current Status, Reason for Last Stop, etc)
return a 40 character space padded string. For example, “Testing” would be sent as
“Testing_________________________________” where the underscores represent the number of
spaces that are required to make the text 40 characters long. This format is referred to as “Standard
Text” in this document.
Section 5.5 Commands From Link Equipment to PLC
These commands originate from the Link equipment and require a response from the PLC. If a proper
response is not received after three tries, then a communications error will be displayed in the PLC
interface operator screen and a top stop will be sent to the press control.
Section 5.5.1 Job Number Command
This is sent to notify the PLC that a job change has occurred.
From Link:
[LF]JOB=#########[CR]
where:
######### is a nine digit job number.
Reply from PLC:
return of message.
Notes:
If “Send Job Num” is “Yes” in the PLC main configuration screen, then this command will be sent
automatically when the Link equipment is powered up and whenever the job changes (whether by
user selection or PLC command). In addition, the PLC can request the job number at any time (see
section 5.6.1).