GFK-2721A
Chapter 4 Diagnostics
4-5
4
PROFINET Alarms
The PROFINET Scanner reports its own non-fatal errors and errors on modules in the remote
node using PROFINET Diagnosis or PROFINET Pull/Plug alarms.
PROFINET Diagnosis Alarms
Diagnosis Alarms indicate any fault conditions other than a module add, loss, or mismatch that
a VersaMax PROFINET Scanner needs to communicate to the PROFINET Controller. Most
faults generate Diagnosis alarms. Situations that do not send a PROFINET Diagnosis are
covered in a later section.
When the VersaMax PROFINET Scanner detects a fault condition, it sends a Diagnosis alarm
to the IO-Controller. If there is a Primary Application Relationship (AR) currently active that
includes the affected module, the VersaMax PROFINET Scanner sends the Diagnosis alarm
over that AR. Otherwise, the alarm is placed in diagnosis memory in the PROFINET Scanner to
be read later, and no alarm is sent. The Scanner’s FAULT LED is ON and the FAULT status bit
(see bit definitions earlier in this chapter) is set to 1. An alarm is not generated on subsequent
connections.
The PROFINET Scanner automatically clears (and sends Diagnosis Disappears alarms for)
these diagnosis faults after the fault condition has been corrected. If no additional conditions
exist in memory, the FAULT LED is turned OFF and the FAULT status bit is set to 0.
The table on the next page lists the faults reported to the IO-Controller. The VersaMax
PROFINET Scanner generates all of its application faults as channel diagnosis faults. The
AlarmType is Diagnosis or Diagnosis Disappears. The left column lists the Channel Error Type
in PROFINET.
PROFINET Scanner Diagnosis Alarms
Channel
Error
Type
Diagnosis Alarm
Type
Module
or
Channel
Error
Cause
Fault Text
Recommendation
1
Channel Diagnosis
Appears / Disappears:
Short Circuit
Module
Short Circuit.
MDL741/742/842
ESCP protection
activated. (>0.5A total
drawn)
Short Circuit
Overcurrent/Short exists on at
least one channel.
1
Channel Diagnosis
Appears / Disappears:
Short Circuit
Channel
Short Circuit. MDL730
ESCP tripped (> 2A
drawn)
Short Circuit
Overload/Short on channel has
existed and the latched fault has
not been cleared by user.
6
Channel Diagnosis
Appears / Disappears:
Line Break
Channel
Open Wire.
ALG262/264 are in 4-
20mA and the current
is below 4mA.
Line Break
Verify wiring and that current
source is energized.
7
Channel Diagnosis
Appears / Disappears:
Upper limit value
exceeded
Channel
High Alarm.
Channel value is above
configured Hi Alarm
Upper limit
value
exceeded
Bring process value below
configured high alarm level
