Siemens SIMATIC ET 200AL System Manual page 2076

Overload
Activating the "Overload" checkbox activates the diagnostics of the thermal monitoring of the
output level. The "Overload" diagnostics is triggered when the maximum temperature is
exceeded at the output and is detected channel by channel.
The maximum temperature may be exceeded for the following reasons:
● Ambient temperature is too high
● Output is being operated outside the specification
Note
Overload
Please note that overload exposes the modules to a high thermal load. This can affect the
output channels. You should therefore avoid continuously running analog output modules in
overload.
Analog value processing
Function Manual, 06/2014, A5E03461439-AC
What you should know about analog technology
2.14 Diagnostics
45