Siemens simatic s7-400 FM 450-1 - Page 31

Wiring
4.4 Module status after power is switched on
Counter module FM 450-1
Manual, 02/2014, A5E03648739-02
31
Terminal
Name
Inputs/
outputs
Function
5 V encoder RS
422, symmetrical
24 V encoder,
asymmetric
24-V pulse
encoder with
direction level
24 V initiator
Counter 1
29
1I0
ON
Digital input 1I0
30
1I1
ON
Digital input 1I1
31
1I2
ON
Digital input 1I2 (set counter)
32
-
33
1Q0
OFF
Digital output 1Q0
34
1Q1
OFF
Digital output 1Q1
35
-
36
-
37
-
38
-
39
-
40
-
Counter 2
41
2I0
ON
Digital input 2I0
42
2I1
ON
Digital input 2I1
43
2I2
ON
Digital input 2I2 (set counter)
44 -
45
2Q0
OFF
Digital output 2Q0
46
2Q1
OFF
Digital output 2Q1
47
2L+
ON
24 V load voltage for the digital inputs and outputs
48
2M
ON
Load voltage ground for digital inputs and outputs
Note
The circuits for the counter inputs (encoder power supply,
encoder signals) are isolated
electrically toward the ground of the CPU. Hence you must connect terminal 4 (1M) to the
ground of the CPU with a low impedance!
If you supply the encoders with external voltage, you must also connect the mass of this
externa
l voltage supply to the ground of the CPU.
Auxiliary voltage 1L+, 1M
To supply the 5 V and 24 V encoders with voltage, connect a 24 DC V to the 1L + and 1M
terminals.
An integrated diode protects the module from reversing the polarity of the auxiliary voltage.
The module monitors whether the auxiliary voltage is connected.