Debugging and troubleshooting
10.7 Hardware troubleshooting guide
S7-200 SMART
578
System Manual, V2.3, 07/2017, A5E03822230-AF
10.7
Hardware troubleshooting guide
Table 10- 1 Troubleshooting guide for the S7-200 SMART hardware
Symptom
Possible cause
Possible solution
Outputs stop working
The device being controlled has
caused an electrical surge that dam-
aged the output
When connecting to an inductive load
(such as a motor or relay), a proper
suppression circuit should be used.
Refer to the wiring guidelines in Chap-
ter 3.
Wiring loose or incorrect
Check wiring and correct
Excessive load
Check load against contact ratings
Output point is forced
Check the CPU for forced I/O
ERROR light on the CPU turns on
(Red)
Electrical noise
Refer to the wiring guidelines in Chap-
ter 3. It is very important that the con-
trol panel is connected to a good
ground and that high voltage wiring is
not run in parallel with low voltage
wiring.
Connect the M terminal on the 24 V DC
Sensor Power Supply to ground
Component damage
Send in hardware for repair or re-
placement
None of the CPU LEDs turn on
Blown fuse
Use a line analyzer and monitor the
input power to check the magnitude
and duration of the over-voltage spikes.
Based on this information, add the
proper type surge arrestor device to
your power wiring.
Reversed 24 V power wires
Refer to the wiring guidelines in Chap-
ter 3 for information about installing the
field wiring.
Incorrect voltage
Intermittent operation associated with
high energy devices
Improper grounding
Refer to the wiring guidelines in Chap-
ter 3.
Routing of wiring within the control
cabinet
It is very important that the control
panel is connected to a good ground
and that high voltage wiring is not run
in parallel with low voltage wiring.
Connect the M terminal on the 24 V DC
Sensor Power Supply to ground.
Time delay on input filters too short
Increase the input filter delay in the
system data block.
Содержание SIMATIC S7-200
Страница 30: ...Product overview 1 7 Programming software S7 200 SMART 30 System Manual V2 3 07 2017 A5E03822230 AF ...
Страница 267: ...Program instructions 7 6 Counters S7 200 SMART System Manual V2 3 07 2017 A5E03822230 AF 267 HSC modes 3 and 4 ...
Страница 394: ...Program instructions 7 18 Subroutine S7 200 SMART 394 System Manual V2 3 07 2017 A5E03822230 AF ...
Страница 425: ...Communication 8 5 PROFIBUS S7 200 SMART System Manual V2 3 07 2017 A5E03822230 AF 425 ...
Страница 786: ...Technical specifications A 11 S7 200 SMART cables S7 200 SMART 786 System Manual V2 3 07 2017 A5E03822230 AF ...
Страница 798: ...Error codes C 4 PLC fatal error codes S7 200 SMART 798 System Manual V2 3 07 2017 A5E03822230 AF ...
Страница 848: ...Ordering information F 6 Human Machine Interface devices S7 200 SMART 848 System Manual V2 3 07 2017 A5E03822230 AF ...