AO895 Section 3 Run-time Operation
114 3BSE027630-600 B
Shows if there are any responses in use for the primary master. Can be flushed
with using the service function "Flush completed delayed response".
• Number of retries for busy response
Shows the configured number of retries for a busy response from the
instrument to the module.
Default number of retries is 2.
• Number of retries for error response
Shows the configured number of retries for an error response between the
instrument and the module.
The following is determined for an error response:
– Instrument time-out: when the maximum amount of time that an I/O
module will wait before deciding that the instrument has failed is elapsed.
The value is fixed to 33 character times (305 ms)
– Outgoing communication error: when bit 7 is set in the reply status first
byte
– Incoming communication error:
- byte count error (received data byte number differs from byte count field)
- command number error (received command number differs from
transmitted one)
- received address error
- check sum error
- character error (parity, overrun, framing error)
Default number of retries is 2.
•Scan enabled
The scanning function is implemented to monitor the presence of field
instruments.
When the scanning is enabled or if diagnosis is read all instruments of the
instruments list are scanned (a different channel every 5 s).
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