Siemens simatic s7-1500 User Manual page 33

Reference junction for TC
The following settings can be configured for the reference junction parameter:
Table 4- 3 Possible parameter assignments for the reference junction parameter TC
Setting
Fixed reference temperature
Dynamic reference temperature
Internal reference junction
Reference channel of the module
Hardware interrupt 1 or 2
Enable a hardware interrupt at violation of high limit 1 or 2 or low limit 1 or 2.
Low limit 1 or 2
Specifies the low limit threshold that triggers hardware interrupt 1 or 2.
High limit 1 or 2
Specifies the high limit threshold that triggers hardware interrupt 1 or 2.
Operating mode Fast / Standard
You can use this parameter to determine the operating mode for the module.
● Fast mode; easy integration time with less frequency suppression (minimal integration
time 2.5 ms)
● Standard mode; triple integration time with higher frequency suppression (minimal
integration time 7.5 ms)
Scalable measuring range
With this parameter, you disable or enable the scalable measuring range function.
Measuring range resolution
With this parameter, you determine the resolution to 2 or 3 decimal places.
Analog Input Module AI 8xU/R/RTD/TC HF (6ES7531-7PF00-0AB0)
Manual, 09/2016, A5E36647959-AB
Description
The reference junction temperature is configured and stored in the module as
a fixed value.
The reference junction temperature is transferred in the user program from the
CPU to the module by data records 192 to 200 using the WRREC (SFB 53)
instruction.
The reference junction temperature is determined using an integrated sensor
of the module.
The reference junction temperature is determined using an external resistance
thermometer (RTD) at the reference channel (CH8) of the module.
Parameters/address space
4.3 Declaration of parameters
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