Manual VIPA System 200V Chapter 2 Analog input modules
HB97E - SM-AIO - Rev. 12/32 2-57
The upper and the lower limit value is parameterizable for every channel.
Please regard during parameterization that you have to enable the limit
value monitoring in parameter byte 1.
If the signal is beyond the defined operation range, a process alarm is
initialized. In the CPU, the process alarm block (OB 40) is called.
The 4byte of process alarm additional information are used as follows:
Process alarm additional information
Byte Bit 7 ... Bit 0 Default
0 Bit 0: upper limit exceeded channel 0
Bit 1: upper limit exceeded channel 1
Bit 2: upper limit exceeded channel 2
Bit 3: upper limit exceeded channel 3
Bit 7 ... 4: reserved
00h
1 Bit 0: lower limit underrun channel 0
Bit 1: lower limit underrun channel 1
Bit 2: lower limit underrun channel 2
Bit 3: lower limit underrun channel 3
Bit 7 ... 4: reserved
00h
2 reserved 00h
3 reserved 00h
Note!
When a process alarm has not yet been acknowledged by the CPU and a
new process alarm of the same type occurs at this channel, a diagnostic
interrupt is initialized, containing the information "Process alarm
missing/lost" (diagnostic data byte 3).
Process alarm
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