6 PROFIBUS communication
6.6 Parameterising temperature measurement
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Lenze · I/O system 1000 · Reference Manual · DMS 5.0 EN · 09/2016 · TD17
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Diagnostics and alarm
Process alarm
A process alarm causes a call of the OB 40. Within the OB 40 you have the possibility of determining
the logic basic address of the module that has triggered the process alarm via the local word 6.
Further information on the triggering event can be found in the "Local double word 8".
Local double word 8 of OB 40:
4-wire: 0 ... 3000
(0xE2)
3528 32511 Overflow
0 ... 3000 0 ... 27648 Nominal range
--Underflow
Trigger Process alarm Diagnosealarm parameterisable
Configuration/parameterisation errors - X -
Open circuit detected - X X
Measuring range exceeded - X -
Measuring range not reached - X -
Limit value exceeded X - X
Limit value not reached X - X
Process alarm lost - X -
Local byte Bit 7 ... 0
1 Bit 0: Limit value exceeded channel 1
Bit 1: Limit value exceeded channel 2
Bit 2: Limit value exceeded channel 3
Bit 3: Limit value exceeded channel 4
Bit 7 ... 4: 0 (fixed)
2 Bit 0: Limit value not reached channel 1
Bit 1: Limit value not reached channel 2
Bit 2: Limit value not reached, channel 3
Bit 3: Limit value not reached, channel 4
Bit 7 ... 4: 0 (fixed)
3/4 Ticker value at the time of the alarm
After mains connection, a timer (s ticker) is started, which after 65535 s starts
with 0 again.
Measuring range Measured value Signal range Range
(Fct. no.)
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