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33003405 07/2007 21
Temperature
State/Operating
Temperature
The remote output modules are designed to operate with the maximum temperature
of 60
o
C. The temperature states in single modules and PLCs are evaluated by the
CPU module or the remote output device’s CPU for compact systems. The
temperature state of a particular module or PLC is measured by a sensor. The
sensor monitors the temperature state of the remote output device automatically
and continuously.
The following table shows the ranges in which the temperature state signals the
measured temperature:
Temperature state High temperature indicates the following:
operating temperature = max temperature (delta T)max + ambient temperature
≥ 60°C / 140°F.
In this case, support the internal convection by adding air grilles or increasing the
free space between the remote output devices.
Temperature state Very high temperature indicates the following:
operating temperature = max temperature (delta T)max + ambient temperature
≥ 70°C / 158°F.
In this case, support the internal convection by integrating additional active cooling
elements (fan, coolant devices, etc.) or increasing the free space around the remote
output devices.
If the sensor indicates a temperature increase above the critical threshold, the
temperature state changes. The temperature states can be evaluated using the
Temperature State system signal of the XPSMFWIN.
Temperature range Temperature state
< 60°C / 140°F Normal
60°C to 70°C / 140°F to 158°F High temperature
> 70°C / 158°F Very high temperature
Return to 64°C / 147.2°F High temperature
Return to < 54°C / 129.2°F Normal
Note: The difference in temperature increase and decrease ranges is the result of
the sensor’s hysteresis that equals 6°C / 10.8°F.