Endress+Hauser Cerabar S PMC71, Functional Safety Manual

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Operation Cerabar S PMP71
30 Hauser
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CAUTION
In some cases, (e.g. failure of power supply, a cable open circuit and faults in the
current output itself, where the error current ≥ 21 mA cannot be reached), output
currents ≤ 3.6 mA occur irrespective of the configured failure current. In some other
cases, (e.g. cabling short circuit), output currents ≥ 21.0 mA occur irrespective of the
configured failure current.
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For alarm monitoring, the downstream logic unit must be able to recognize failure
currents of the upper level for signal on alarm (≥ 21 mA) and the lower level for signal
on alarm (≤ 3.6 mA).
5.3 Alarm and warning messages
5.3.1 List of alarm and warning messages
Additional information is provided by the alarm and warning messages in the form of
error codes and associated plain text messages.
Parameter Description Factory setting Parameterization method with increased security during parameter
entry
FW 02.20 FW ≥ 02.30.zz Permitted SIL setting FW ≤ 02.20
1)
FW ≥ 02.30.zz
115 Sensor over pressure Warning Warning Warning or alarm Alarm As per client setting
(default: warning)
120 Sensor low pressure Warning Warning Warning or alarm Alarm
620 Current output out of range Warning Warning Warning or alarm Alarm
715 Sensor over temperature Warning Warning Warning or alarm Alarm
720 Sensor under temperature Warning Warning Warning or alarm Alarm
717 Transmitter over temp. Warning Warning Warning or alarm Alarm
718 Transmitter under temp. Warning Warning Warning or alarm Alarm
726 Sens. temp. error overrange Warning Alarm Alarm Alarm Alarm
727 Sens. pres. error
overrange
2)
Warning Warning Warning or alarm Alarm As per client setting
(default: warning)
Alarm current Output fail mode MAX MAX MIN. or MAX MAX As per client setting
(default: MAX.)
1) Settings are automatically changed from warning to alarm via the parameterization method
2) The setting influences the parameters for functional safety
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WARNING
In the case of devices with firmware version ≤ 02.20.04, certain messages in the
SAFETY CONFIRM. menu (increased security during parameter entry) are
automatically set from warning to alarm.
Do not use the SAFETY CONFIRM. sequence if the pressure in the applications is outside
the set current or measuring range.
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Standard device configuration and software/hardware locking is recommended in such
applications.