Siemens CSM 1277 User Manual

Technical specifications
A.8 RTD and Thermocouple modules
Easy Book
Manual, 03/2014, A5E02486774-AF
327
Table A- 57 Resistance
Range
Under range
minimum
Nominal range
low limit
Nominal range
high limit
Over
range
maximum
1
Normal range
accuracy
@ 25 °C
Normal range
accuracy
-20 °C to 60 °C
150 Ω
n/a
0 (0 Ω)
27648 (150 Ω)
176.383 Ω
±0.05%
±0.1%
300 Ω
n/a
0 (0 Ω)
27648 (300 Ω)
352.767 Ω
±0.05%
±0.1%
600 Ω
n/a
0 (0 Ω)
27648 (600 Ω)
705.534 Ω
±0.05%
±0.1%
1
Resistance values above the over-range maximum value are reported as 32767.
A.8.8
RTD filter selection and update times
Table A- 58 Filter selection and update times
Noise rejection
frequency (Hz)
Integration time
(ms)
Update time (seconds)
1-channel SB
4-channel SM
8-channel SM
10 100 4-/2-wire: 0.301
3-wire: 0.601
4-/2-wire: 1.222
3-wire: 2.445
4-/2-wire: 2.445
3-wire: 4.845
50 20 4-/2-wire: 0.061
3-wire: 0.121
4-/2-wire: 0.262
3-wire: .505
4-/2-wire: 0.525
3-wire: 1.015
60 16.67 4-/2-wire: 0.051
3-wire: 0.101
4-/2-wire: 0.222
3-wire: 0.424
4-/2-wire: 0.445
3-wire: 0.845
400
1
10 4-/2-wire: 0.031
3-wire: 0.061
4-/2-wire: 0.142
3-wire: 0.264
4-/2-wire: 0.285
3-wire: 0.525
1
To maintain module resolution and accuracy when the 400 Hz filter is selected, the integration time is 10 ms. This
selection also rejects 100 Hz and 200 Hz noise.
Note
The module reports 32767 on any activated channel with no sensor connected. If open wire
detection is also enabled, the module flashes the appropriate red LEDs.
Best accu
racy will be achieved for the 10 Ω RTD ranges if 4 wire connections are used.
The resistance of the connection wires in 2 wire mode will cause an error in the sensor
reading and therefore accuracy is not guaranteed.

Siemens CSM 1277 Specifications

General

Brand	Siemens
Model	CSM 1277
Category	Controller
Language	English