Siemens SIMATIC - Page 420

Analog modules
6.11 Analog input module SM 331, AI 6 x TC isolated (6ES7331-7PE10-0AB0)
S7-300 Module data
420 Manual, 06/2017, A5E00105505-AJ
Technical specifications
The accuracy of the temperature measurement with external
compensation by means of thermoresistors connected locally or
via remote access by means of an external thermoresistor mod-
ule
is derived from:
(4)
• Error for the analog input of the type of thermocou-
ple used
• Measuring accuracy for the type of thermoresistor
used for compensation purposes
• Error for the compensation input (local connection)
± 0.5 K
• Error for the thermoresistor module (remote con-
nection)
The accuracy of the temperature measurement with compensa-
tion of the external reference junction, which is maintained at 0
°C/50 °C,
is derived from:
(4)
• Error for the analog input of the type of thermocou-
ple used
• Measuring accuracy for the temperature of the
reference junction
Temperature error (relative to input range)
Voltage input
• ± 25 mV
• ± 50 mV
• ± 80 mV
• ± 250 mV
• ± 500 mV
• ± 1 V
± 0.0023%/K
± 0.0015%/K
± 0.0010%/K
± 0.0010 %/K
± 0.0010 %/K
± 0.0010%/K
Thermocouple (at integration time of 100 ms)
Type T
Type U
Type E
Type J
Type L
Type K
Type N
Type R
Type S
Type B
Type C
Type TxK/XK(L)
± 0.0060 K/K
± 0.0175 K/K
± 0.0086 K/K
± 0.0086 K/K
± 0.0175 K/K
± 0.0143 K/K
± 0.0175 K/K
± 0.0115 K/K
± 0.0115 K/K
± 0.0200 K/K
± 0.0515 K/K
± 0.0143 K/K
Linearity error (relative to input range)
± 0.05%
Repeat accuracy (in settled state at
25 °C, relative to input range)
± 0.05%