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Bit 2 = 1: first loop of requests not ended (values in the input
So, if the first byte is equal to 0, the interface is working
properly, otherwise there is a problem.
Each nibble in the bytes following the interface status byte
represents the status of the last attempt to write a parameter
with following coding (diag status byte):
0
1
2
3
4
5
6
F
The ProfiBus external diagnosis services are used to report
following unexpected situations:
Controller fail: if the controller goes in fail mode, an
User parameter mismatch: if the user sets one or more
TwisTorr 304 FS AG Rack Controller User Manual / 87-901-029-01
data are not fully coherent yet)
Write success
Controller response was "NACK"
Controller response was "Unknown window"
Controller response was "Bad Data Type"
Controller response was "Over range"
Controller response was "Bad operation"
Controller response was an unknown response
Parameter not supported by the controller
external diagnostic service is required and one byte in the
diagnostic buffer signals the type of failure.
parameters out of their allowed range, a ProfiBus external
diagnostic service is required and some bits in the diagnosis
frame signals which parameter is wrong (i.e. over range or
under range).
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