Characteristics and Technical Specifications of the SM 335
1-5
SM 335 – High-Speed Analog Input/Output Module for the SIMATIC S7-300
6ES7 335-7HG00-8BA1
1.3 Block diagram of the SM 335
Block diagram
Figure 1-2 shows the block diagram of the SM 335. You will find detailed technical
specifications for the SM 335 on the following pages.
Logic
A
D
CH0
CH1
CH2
CH3
CH0
CH1
CH2
CH3
10 V
Open-wire
test circuit
A
D
24 V
Internal power supply
Galvanic isolation
SIMATIC S7-300
backplane bus
IZ
Analog outputs
Sensor power
supply
Analog inputs
Interval Counter Input
Fig. 1-2 Block Diagram of the SM 335
Galvanic isolation
As you can see from Figure 1-2, the SM 335 contains different analog parts.
The analog outputs are isolated from the backplane bus of the SIMATIC S7-300.
The outputs are on the same potential M
ANA
. The output for sensor supply has the
same potential M
ANA
as the analog outputs.
The analog inputs are isolated from each other and from the backplane bus of the
SIMATIC S7-300.
The input for the interval counter IZ is isolated from the other analog parts and
from the backplane bus of the SIMATIC S7-300.
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