Siemens SIMATIC S7 System Manual page 757

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It is recommended for measuring thermocouples that a 100 ms integration time be used. The

use of smaller integration times will increase the repeatability error of the temperature

After power is applied, the module performs internal calibration for the analog-to-digital

converter. During this time the module reports a value of 32767 on each channel until valid

data is available on that channel. Your user program may need to allow for this initialization

time. Because the configuration of the module can vary the length of the initialization time,

you should verify the behavior of the module in your configuration. If required, you can

include logic in your user program to accommodate the initialization time of the module.

Representation of analog values for Thermocouple Type J

A representation of the analog values of thermocouples type J is shown in the table below.

Table A- 123 Representation of analog values of thermocouples type J

Type J in °C

Faulty wiring (for example, polarity reversal, or open inputs) or sensor error in the negative

range (for example, wrong type of thermocouple) may cause the thermocouple module to

signal underflow.

S7-200 SMART

System Manual, V2.3, 07/2017, A5E03822230-AF

A.5 Thermocouple and RTD expansion modules (EMs)

Type J in °F

Technical specifications

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Simatic s7-200 smart