Siemens 181

Parameters/address space
4.3 Explanation of Parameters
Analog input module AI 4xRTD/TC 2-/3-/4-wire HF (6ES7134-6JD00-0CA1)
24 Manual, 02/2014, A5E03573289-AD
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 RTD channel
Setting Description
No reference channel mode The temperature value at channel 0 can be used as a reference
value for the entire module.
Reference channel of group 0,
1, 2, 3
The channel acts as a transmitter for the reference junction
temperature of a group. The distribution is performed via the
interface module.
Setting Description
Channel x Reference junction
activated
• Disable: Channel x is configured with the setting
"No reference channel mode".
• Enable: Channel x is configured with the setting selected above.
Table 4- 7 TC channel
Setting Description
Reference channel of the
module
The corresponding TC channel uses channel 0 of the same module
as the reference junction temperature. This must be configured as
"Thermal resistor Pt 100 climatic range Degrees Celsius" and
"No reference channel mode"; otherwise, Diagnostics: Reference
junction is triggered.
Internal reference junction The reference junction temperature is read by an internal
temperature sensor on the BaseUnit. Diagnostics: Reference
junction is triggered if there is an incorrect BaseUnit type.