Siemens simatic s7-400 FM 450-1, User Manual, Page: 14 / 130

Product Overview
1.5 The FM 450-1 software
Counter module FM 450-1
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Manual, 02/2014, A5E03648739-02
Diagnostic and status LEDs
The FM 450-1 has 16 LEDs. The LEDs are for diagnostic purposes and indicate the state of
the FM 450-1 and its digital inputs and outputs. The following table lists labeling, color and
function of the LED displays.
Table 1- 2 Labeling, color and function of the LEDs
Labeling Color Function
INTF Red Internal error
EXTF Red External error
CH1 CR
CH2 CR Green Counter in operation; status of the lowest value bit of counter 1 (CH 1) or
counter 2 (CH2)
CH1 DIR
CH2 DIR Green Count direction; LED illuminated if counter 1 (CH1) or counter 2 (CH2) is
counting backwards.
CH1 IN 0
CH2 IN 0 Green Status of input 1I0 of counter 1 and/or 2I0 of counter 2
CH1 IN 1
CH2 IN 1 Green Status of input 1I1 of counter 1 and/or 2I1 of counter 2
CH1 IN 2
CH2 IN 2 Green Status of input 1I2 of counter 1 and/or 2I2 of counter 2
CH1 OUT 0
CH2 OUT 0 Green Status of output 1Q0 of counter 1 and/or 2Q0 of counter 2
CH1 OUT 1
CH2 OUT 1 Green Status of output 1Q1 of counter 1 and/or 2Q1 of counter 2
Front connectors
The front connector has the following terminals:
● 5-V or 24-V encoder signals for counters 1 and 2
● Encoder supply
● Digital input signals to start, stop and set counters 1 and 2
● Digital output signals Q0 and Q1 for counters 1 and 2
● Auxiliary voltage 1L+ to generate the encoder supply voltages
● Load voltage 2L+ to supply the digital outputs
The front connector can be ordered separately (see chapter "Spare parts (Page 119)").