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 Reference junction
activated
Table 4- 7
Setting
Reference channel of the
module
Internal reference junction
Reference channel of group 0,
1, 2, 3
Fixed reference temperature
Setting
Channel x Reference junction
activated
Analog input module AI 8xRTD/TC 2-wire HF (6ES7134-6JF00-0CA1)
Manual, 09/2018, A5E32942580-AB
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 tem-
perature 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 reference junction temperature. This must be configured as
"Thermal resistor Pt 100 climatic range Degrees Celsius" and "No
reference channel mode"; otherwise, Diagnostics: Reference junc-
tion is triggered.
The reference junction temperature is read by an internal tempera-
ture sensor on the BaseUnit. Diagnostics: Reference junction is
triggered if there is an incorrect BaseUnit type.
The channel acts as a receiver for the reference junction tempera-
ture of the group.
The reference temperature of the thermocouple is set to 0 °C. As a
result, no temperature compensation is performed.
Description
Disable: Channel x is configured with the setting "Fixed refer-
•
ence temperature".
Enable: Channel x is configured with the setting selected above.
•
Parameters/address space
4.3 Explanation of parameters
27