Temperature Monitoring - Siemens SIMATIC S7-1500 System Manual

13.7

Temperature monitoring

The SIMATIC Drive Controller has integrated temperature monitoring. Temperature
monitoring ensures that the SIMATIC Drive Controller is only operated within the permissible
temperature range. This prevents device defects and undefined device behavior.
Function
Temperature sensors monitor the inside temperature. There are temperature thresholds with
the following reactions in the event of overtemperature:
Inside temperature
Exceeds threshold 1
Exceeds threshold 2
Evaluation of interrupts
You evaluate the interrupt and corresponding information with the "RALRM" instruction.
Call the "RALRM" instruction in the diagnostic interrupt OB (OB82).
Table 13- 3
Byte
0 to 1
2 to 3
4
5
6 to 7
SIMATIC Drive Controller
System Manual, 11/2019, A5E46600094-AA
Maintenance event Reaction
CPU overtempera-
ture (warning)
CPU overtempera-
ture (error)
Structure of the additional interrupt information in an overtemperature warning
Data type Meaning
WORD Format identifier for the structure of the following data serving as additional
interrupt
information.
The overtemperature information is provided with the format identifier
W#16#8000 (channel diagnostics).
WORD Channel number of the component that triggered the interrupt:
W#16# 0C72: PLC hardware
BYTE Bits 0 to 2:
Bits 3 to 4:
Bits 5 to 7:
BYTE Data format: Not relevant
WORD Error type:
W#16#0005: Overtemperature
MAINT LED lights up in yellow.
An entry is made in the diagnostic buffer.
The diagnostic interrupt OB (OB82) is called.
For details, see Evaluation of interrupts.
ERROR LED flashes red.
An entry is made in the diagnostic buffer.
The SIMATIC Drive Controller switches to STOP and
a start-up lock is set.
Reserved
Error type:
0: Reserved
1: Incoming error
2: Outgoing error
3: Outgoing error, other errors present
Channel type: Not relevant
Maintenance
13.7 Temperature monitoring
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