West Control Solutions KS 800 Profibus Interface Manual - Manual (Page 15)

3.2 Status and diagnosis messages
For KS800 instrumwent status signalling, the external (user-specific) diagnosis must be used. The format
corresponds to the instrument-related diagnosis (EN50170 volume 2 PROFIBUS).
Instrument-specific diagnosis Octet 1
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
Bit no. Name Allocation Status ‘0’ Status ‘1’ Type
D0 Online/Conf On-line / configuration on-line configuration status
D1 DO1_12Fail Error do1 ... do12 no yes diagnosis
D2 D=13_16Fail Error do13 ... do16 no yes diagnosis
D3 HCFail Heating current short circuit no yes diagnosis
D4 .. D7 unused, always ‘0’
Instrument-specific diagnosis Octet 2
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
Bit no. Name Allocation Status ‘0’ Status ‘1’ Type
D0 InpF1 Input fail channel 1 no yes diagnosis
D1 InpF2 Input fail channel 2 no yes dianosis
D2 InpF3 Input fail channel 3 no yes diagnosis
D3 InpF4 Input fail channel 4 no yes diagnosis
D4 InpF5 Input fail channel 5 no yes diagnosis
D5 InpF6 Input fail channel 6 no yes diagnosis
D6 InpF7 Input fail channel 7 no yes diagnosis
D7 InpF8 Input fail channel 8 no yes diagnosis
3.3 Disabling mechanism with changes
Changing the reference to a datum to be transmitted during operation, e.g. on-line via parameter channel
or via the engineering interface, implies a hazard of value misinterpreting by bus master and KS800.
This can be prevented by a disabling mechanism.
w When changing a reference, the controller module sets bit Dex = 1.
w The master must evaluate bit Dex.
w Acknowledgement and a statement that there are only valid write data also on the master side, are
generated via a positive flank for bit Dval.
w When receiving a positive flank, the controller module sets Dex = 0 and stores the data which were
sent.
w Resetting Dex is also possible by switching the voltage off and on again.
3.4 Process data transmission
Process data are transmitted cyclically by the controller, whereby compliance with the minimum poll time of
570ms is ensured, if no simultaneous access via the parameter channel is made. Output data sent to KS800
are compared with the previously transmitted values and processed by the controller with deviation. If one of
the data is faulty, bit 8 with error in channel 1, bit 9 with error in channel 2 ... or bit 15 with error in channel
8 is set in the ‘Unit_State’, until no faulty accesses are pending any more.
Process data
15 9499 040 50511