Siemens Pointek CLS200 Operating Instructions Manual page 69

Self tests
Pointek CLS200/300 carries out the following self tests:
Self Tests
Self test func-
tion
Measure the
electronics
temperature
RAM test
Code test
Sensor test
Check service
timers
Watchdog
trigger
A walking one and zero is a method of checking each bit in each location of volatile
1)
memory.
Values of the DIAGNOSIS bit:
• 0 = not set
• 1 = set
Pointek CLS200/CLS300 digital
Operating Instructions, 05/2021, A5E47904060-AA
Algorithm
If electronics temperature
exceeds 85 °C
Writing and verifying every
cell with a byte (walking
one and walking zero ) to
1)
detect defect cells and
crosstalk
Summarizing the bytes and
comparison with a check-
sum
If measurement returns a
value outside the sensor
range determined by
Measuring Limits
If a service timer reaches
the parameterized warning
or alarm limit
The program must pass
specific checkpoints. If all
checkpoints are not passed
within a specific time, the
watchdog timer expires
and a restart will be carried
out
Frequency Diagnostic error
message
Every meas- Electronics tem-
urement perature too high
cycle/ 60 ms
45 s Memory error
45 s Memory error
every meas- Measurement
urement failure
cycle/ 60 ms
60 ms Maintenance re-
quired
2 s Restart
Remote operation
9.2 Status
Corrective meas-
ure
Reduce ambient
temperature to
within permissible
range
Replace the elec-
tronics.
Replace electron-
ics and, if neces-
sary, measuring
cell.
Have sensor
checked by service
department.
Carry out servicing
and reset messag-
es using SIMATIC
PDM.
Check cabling and
power unit to
ensure the power
supply to Pointek
CLS200/ 300
69