• All inputs signal overflow (32767) when you start the I/O device 8 AI RTD/TC 8xM12. After
receiving a compensation value by means of the data record DS2, the I/O device starts
reading the TC inputs and signals correct data.
• The I/O device 8 AI RTD/TC 8xM12 has a watchdog set to 5 minutes that is reset after a
new compensation value was received by means of DS2. If the I/O device in standard
operation does not receive DS2 data within the 5-minute interval of the watchdog, a
diagnostic interrupt "Reference channel fault" is signaled if the "Group diagnostics"
parameter has been enabled.
• When you use ET 200eco PN modules or other modules for measuring the reference
junction temperature, the RTD module parameters/module parameters for the output
structure and measuring accuracy must be represented in the DS2 by bytes 0 and 1. The
figure below "Structure of data record DS2" illustrates this setting.
185
I/O device analog input/analog output
10.1 I/O device analog input
ET 200eco PN
Operating Instructions, 06/2022, A5E01250250-AN
Summary of Contents for SIMATIC ET 200eco PN
Page 233: ...ET 200eco PN Operating Instructions 06 2022 A5E01250250 AN 234 Dimensional drawings C ...
Page 265: ...266 ET 200eco PN Operating Instructions 06 2022 A5E01250250 AN Open Source Software ...
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