BECKHOFF EL1904 - Manual (Page 22)

Operation
20 EL1904
4.1.3.3 Example configuration for temperature measurement
The example configuration for the temperature measurement consists of an EK1100 EtherCAT coupler
with connected terminals that match the typical distribution of digital and analog signal types at a
machine. On the EL6900 a safety project is active, which reads safe inputs and enables all 4 safe outputs
during the measurement.
Note
External heat sources / radiant heat / impaired convection
The maximum permissible ambient temperature of 55°C was checked with the above
example configuration. Impaired convection, an unfavorable location near heat sources
or an unfavorable configuration of the EtherCAT Terminals may result in overheating of
the terminals.
The key parameter is always the maximum permitted internally measured temperature
of 95°C, above which the TwinSAFE terminals switch to safe state and report an error.
The internal temperature can be read from the TwinSAFE components via CoE (see
section 4.4.2 Diagnostic objects).