Ds 96 Read As-I Master Error Counters And Status Messages (Fw V1.1 And Higher) - Siemens SIMATIC ET 200SP Manual

Alarms, faults and system events
8.9 Data records for diagnostics
8.9.2 DS 96 Read AS-i master error counters and status messages (FW V1.1 and
higher)
Meaning
This data record reads out error counters that pertain to the overall AS-i network.
If the AS-i power supply is missing, the overall device fails. This leads to all counters being
reset. The count starts again each time the device is powered up.
Table 8- 11 Meaning of error counter
Count value / Information
AS-i Power Fail
Ground fault
Slave failure
Missing slave message frame
Erroneous slave message frame
I/O fault
Protocol error
Erroneous master frame
Sent master frames
86
Meaning
The count value is incremented when the AS-i power supply drops to a value that is
too low.
The count value is increased when a ground fault has been detected on the AS-i
cable.
The count value is increased when an active slave fails, that is, when process data
transmission has been interrupted. An active slave only fails when it does not
respond to six consecutive master calls.
The count value is increased when a slave does not respond to a master call or the
master does not receive the response. Process data transmission is not interrupted in
this case.
The count value is increased when the master receives an incomplete slave
response, such as when slaves are added during operation. Process data
transmission is not interrupted in this case.
The count value is increased when a slave signals an I/O error.
The count value is increased when the master detects a transmission error for a
slave that needs multiple cycles for transmission of data, e.g. for analog data.
The count value is incremented when a master call cannot be sent correctly, e.g. in
the event of strong interfering signals on the AS-i cable. Process data transmission is
not interrupted in this case.
Number of master frames
This counter counts all frames sent by the master, regardless of whether or not a
slave response was received.
The total number of master frames is calculated as follows:
MT_CNT_TOTAL = (MT_CNT_HIGH x MT_CNT_BASE) + MT_CNT_LOW
The error count starts over each time the device is powered up.
By dividing the absolute values of the error counters by the number of master frames,
it is possible to calculate the percentage of errors and thus the error frequency.
AS-Interface master CM AS-i Master ST (3RK7137-6SA00-0BC1)
Manual, 07/2017, A5E02655262020A/RS-AD/004