Siemens SIMATIC S7-300 FM 350-1 Manual page 27

Pin Assignments of the Front Connector
Table 3- 1 Pin assignments of the front connector
Connection Name
Auxiliary voltage
1 1L+
2 1M
3 1M
4 5.2 VDC
5 24 VDC
6 A A*
7 /A
8 B B*
9 /B
10 N N*
11 /N
12 —
Digital Inputs and Digital Outputs
13 I0
14 I1
15 I2
16 —
17 Q0
18 Q1
Load voltage
19 2L+
20 2M
Note
The circuits for the counter inputs (encoder supply, encoder signals) are non-isolated to the
ground of the CPU, that is, terminal 2 (1M) must have a low-resistance connection to CPU
ground. If this connection does not exist, a malfunction or a defect of the FM 350-1 can
result.
If you supply the encoders externally, you must also connect the ground of this external
voltage with the ground of the CPU.
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01
Input / Function
Output
ON
ON
5 V encoder RS 422,
symmetric
OFF
OFF
OFF
ON Encoder signal A
ON Encoder signal /A
ON Encoder signal B
ON Encoder signal /B
ON Encoder signal N
ON Encoder signal /N
—
ON
ON
ON
—
OFF
OFF
ON
ON
3.1 Pin assignments of the front connector
24 V auxiliary voltage
Auxiliary voltage ground
24 V encoder,
asymmetric
Encoder supply ground
Encoder power supply 5.2 V
Encoder power supply 24 V
Encoder signal B *
Encoder signal N *
Digital input DI Start
Digital input DI Stop
Digital input DI Set
Digital output DO0
Digital output DO1
24 V load voltage
Load voltage ground for the digital inputs and outputs
Wiring the FM 350-1
24 V pulse encoders
with direction level
Encoder signal A *
—
Directional signal
—
—
—
—
—
24 V initiator
—
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