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As a general rule, "CM" must be selected for at least one option so that the optical reader is
accessible via the RS422 interface.
Note
The following applies to all commands:
• The state of the DISA bit is irrelevant.
• There is no group error.
If a group error is still pending, first acknowledge the error.
9.3.2.7
Group error
If a correct command receives a negative acknowledgment even though all the preconditions
are met, there is a group error ("IN_OP" bit not set).
Acknowledging the group error
To acknowledge a group error via CM or PROFINET IO, "CM" or "PROFINET IO" must be
configured as the controller in the WBM ("Settings > Communication > Use > Connection").
Initialization with program selection
Acknowledge the error by "initializing with program selection".
The optical reader changes to processing mode again with the required program. To change
to processing mode, the DISA bit is set automatically and reset again after the status
change. If the DISA bit was set manually before, it remains set after the status change.
Initialization without program selection
If the cause of the group error is to be identified using the Ident profile, initialization without
program selection needs to be used. Note that when using the Ident profile without a
communication module, PROFINET diagnostics can be used.
To initialize without program selection, follow these steps:
1. Start the initialization without program selection.
The group error is not acknowledged by this. There is a value that identifies the group
error in the "STATUS" output double word, however. You can find a list of possible group
errors and the corresponding error codes in section "Error and diagnostics messages
(Page 175)".
2. Finally, repeat the initialization (if required with program selection) to acknowledge the
group error.
After the acknowledgment, the optical reader returns to processing mode. To change to
processing mode, the "DISA" bit is set automatically and reset again after the status
change. If the "DISA" bit was set manually before, it remains set after the status change.
3. Check the "IN_OP" status bit.
This bit is normally set automatically.
SIMATIC MV500
Operating Instructions, 05/2019, C79000-G8976-C494-02
Process interfacing via an automation system (PLC, PC)
9.3 Control with Ident profile
125
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