Connecting The Analog Inputs - Siemens SIMATIC SM 335 Manual

2.2

Connecting the analog inputs

Recommendation
The high conversion speed of the SM 335 means that the interference produced
can have a negative effect on the measurement input voltages in particular.
The configuration described below is in general the configuration, which is least
susceptible to interference.
The SM 335's analog inputs and the associated zero potential should be con-
nected to a terminal block, and the zero potential for the analog inputs distrib-
uted over the block.
Configuration
The result is the following basic configuration:
Twisted-pair,
shielded
Sensor 0
Sensor 1
Sensor 2
Sensor 3 Sensor 3
CGP=Central Grounding Point
Fig. 2-1
SM 335 – High-Speed Analog Input/Output Module for the SIMATIC S7-300
6ES7 335-7HG00-8BA1
Connecting the Inputs and Outputs of the SM 335
Terminal block
Connecting Sensors to the Analog Inputs on the SM 335
SM 335
6 M
ANA
9 M
0+
10 M
0–
11 M
1+
12 M
1–
13 M
2+
14 M
2–
15 M
3+
16 M
3–
CGP
CH0
CH1
CH2
CH3
2-3