Trigger; Write Match String - Siemens SIMATIC MV540 H Operating Instructions Manual

Process interfacing via an automation system (PLC, PC)
9.6 Control via TCP/IP and RS232
● Saving programs.
● Setting "Digital out".
A control command is triggered in each case by the corresponding string.
Table 9- 53
Command

Trigger

Write match string

Set DISA bit
Reset DISA bit
Query status
Program change
(select program number)
Save program
with internal trigger
Save program
with external trigger
Reset command
Set digital out
9.6.1 Trigger
When the optical reader receives a character string that is identical to the configured
character string in the WBM, it triggers image acquisition and processing.
9.6.2 Write match string
Note
Sent match string takes effect immediately
A sent match string takes effect immediately. The sent match string is not synchronized with
the trigger signal or the processing of buffered acquired images.
Therefore, ensure that the match string is sent when no image acquisition is running.
Requirement for matching with 1D/2D codes
All match options ("All", "Position", "ID", "GS1") are supported for 1D/2D codes. The match
string that is sent must be formatted in such a way that the information required for the
match can be extracted.
154
Overview of all commands with a string
String
Identical to the configured string in the WBM
You can find a description of the command in the section
"Write match string (Page 154)".
MDIH
MDIL
MGST
MR<programnr>
MI<programnr>
MT<programnr>
MRES
MO<p1><p2><p3><p4><p5><p6>
Operating Instructions, 06/2018, C79000-G8976-C494-01
SIMATIC MV500