Simple Match (Match Mode And Match Match) - Siemens SIMATIC MV440 Operating Instructions Manual

Image processing
4.4 Options for image acquisition and image processing
4.4.5.2

Simple match (MATCH mode and MATCH match)

Note
MATCH command not suitable for changing during production
In contrast to the XMATCH command, the MATCH command is not suitable for changing
during production.
For comparison tasks that are not complex, the match string can:
● Be specified permanently when the program is saved.
● be specified by a simple MATCH command from a connected controller or a PC.
MATCH is available via the interfaces TCP, RS-232 and ASM. The section "Process
interfacing via an automation system (PLC, PC) (Page 233)" explains the MATCH command
and the structure of the MATCH command in detail.
Static match default when saving a program
For applications in which the match default is already known during commissioning, the
match can be defined and activated when the program is saved.
● Match options are available for 1D/2D codes on the "Decoder"/"Match options" tabs
under" "Options".
● To compare a plain text with "Text-Genius" optical character recognition:
The default can be specified separately for each OCR step in "OCR/Filter", "String
specification". The comparison is activated with "OCR"/"Output".
Simple comparison default by the connected controller/PC
The use of the MATCH command it is practical if, for example, the current date, the batch
number or similar needs to be updated prior to the start of production. The MATCH
command can be sent to the reader via the TCP, RS-232 and ASM interfaces.
The match string received by the reader is valid as of the next trigger.
The sent match string remains valid:
● until another match string is sent
● until processing mode is ended (for example by a fault)
If a further match string was sent and in the meantime no evaluation was triggered, the
previously sent match string is overwritten.
If the relevant comparison mode is enabled, a sent match string for the comparison of the
content is used in the following situations:
● A single 1D/2D code
● For each single 1D/2D code (with multicode)
● For each OCR step
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SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06