Explanation Of Parameters - Siemens 181 Workshop Manual

4.3

Explanation of parameters

Diagnostics: Missing supply voltage L+
Enabling of the diagnostics for missing or insufficient supply voltage L+.
Diagnostics: Reference junction
Enabling of the reference junction diagnostics if the reference temperature of the reference
junction needs to be determined for the TC channel being operated.
Reference junction using the PROFINET 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".
A possible parameter assignment is represented below:
Table 4- 4
Setting
No reference channel mode
Reference channel of group 0,
1, 2, 3
Table 4- 5
Setting
Reference channel of the
module
Internal reference junction
Reference channel of group 0,
1, 2, 3
Fixed reference temperature
Analog input module AI 4xRTD/TC 2-/3-/4-wire HF (6ES7134-6JD00-0CA1)
Manual, 02/2014, A5E03573289-AD
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.
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
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 incorrect 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.
Parameters/address space
4.3 Explanation of Parameters
23