Siemens SIMATIC ET 200SP Manual page 29

Parameters/address space
4.3 Explanation of parameters
Note
Shared Device and "Reference channel of group 0, 1, 2, 3"
If the transmitter and receiver for the reference junction temperature of a group are assigned
to different IO controllers, then both IO controllers must be performing data exchange with
the IO device to ensure error-free operation of the temperature compensation.
Reference junction using the PROFIBUS GSD file
A BaseUnit with an internal temperature sensor (BU..T), the reference channel of group 0, 1,
2, 3, or channel 0 of the I/O module can be used as reference junction for the TC
measurement, if this has the parameter setting "Thermal resistor Pt100 climatic range
Degrees Celsius".
The set temperature unit (e.g. Degrees Celsius) is valid for the entire module with
temperature compensation "Reference channel of the module" and "Reference channel of
group 0, 1, 2, 3".
Table 4- 6
Setting
No reference
channel mode
Reference channel
of group 0, 1, 2, 3
Setting
Channel x Refer-
ence junction acti-
vated
Table 4- 7
Setting
Reference channel
of the module
Internal reference
junction
Reference channel
of group 0, 1, 2, 3
Fixed reference
temperature
28
RTD channel
Description
The temperature value at channel 0 can be used as a reference value for the
entire module.
The channel acts as a transmitter for the reference junction temperature of a
group. The distribution is performed via the interface module.
Description
Disable: Channel x is configured with the setting "No reference channel
•
mode".
Enable: Channel x is configured with the setting selected above.
•
TC channel
Description
The corresponding TC channel uses channel 0 of the same module as the ref-
erence junction temperature. This must be configured as "Thermal resistor Pt
100 climatic range Degrees Celsius" and "No reference channel mode"; other-
wise, Diagnostics: Reference junction is triggered.
The reference junction temperature is read by an internal temperature sensor
on the BaseUnit. Diagnostics: Reference junction is triggered if there is an in-
correct BaseUnit type.
The channel acts as a receiver for the reference junction temperature of a
group.
The reference temperature of the thermocouple is set to 0 °C. As a result, no
temperature compensation is performed.
Analog input module AI 4xRTD/TC 2-/3-/4-wire HF (6ES7134-6JD00-0CA1)
Manual, 09/2018, A5E03573289-AE