Siemens SIMATIC MV500 Operating Instructions Manual page 91

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 optical reader via the interface for PROFINET (Ident), TCP, RS232 and
communication module.
The match string received by the optical 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 no processing was triggered in the meantime, the
previously sent match string is overwritten.
When compare mode is enabled, a match string comparison is performed in the following
cases:
• For single 1D/2D codes
• For each individual 1D/2D code (with multicode)
• For each OCR step
Logging the received match strings
If the received match strings are not deactivated, the match strings are logged in the
diagnostics data records. With a suitable format text, used match strings can be output as the
result string and also logged in the diagnostics data records.
SIMATIC MV500
Operating Instructions, 03/2021, C79000-G8976-C494-05
3.4 Options for image acquisition and image processing
Image processing
91