Fail-safe inputs / double inputs
LED state Description, cause Remedy
F_DI z
(Input x, (x+1)+, (x+1)-)
Continuous
light
–
LED x
–
–
LED x+1
Red
–
NC contact / NC contact
1)
: (z = 0..9, x = 0, 2, ..18)
Different signal states at inputs x and x+1
No signal at input x and no signal at input x+1
–-
Continuous
light
–
–
–
Red
–
NC contact / NO contact
1)
: (z = 0..9, x = 0, 2, ..18)
Identical signal states at inputs x and x+1
No signal at input x and a signal at input x+1
Continuous
light
Continuous
light
LED x
Green
Green
LED x+1
Green
Green
NC contact / NC contact
1)
: (z = 0..9, x = 0, 2, ..18)
One signal at input x and one signal at input x+1
NC contact / NO contact
1)
: (z = 0..9, x = 0, 2, ..18)
A signal at input x and no signal at input x+1
–-
1)
Inputs x+1 (DI 1+, 3+, .. 19+) can be set individually via parameter p10040 (TM54F).
p10040 (TM54F) = 0: Input x+1 is an NC contact.
p10040 (TM54F) = 1: Input x+1 is an NO contact.
Factory setting: p10040 (TM54F) = 0 for all inputs x+1.
Single digital inputs, not fail-safe
LED state Description, cause Remedy
DI x
– Off No signal at digital input x (x = 20..23) –
Green Continuous
light
Signal at digital input x –
Fail-safe digital outputs with associated readback channel
LED state Description, cause Remedy
F_DO y (0+..3+, 0-..3-)
Green Continuous
light
Output y (y=0 .. 3) has a signal –
Read back input DI 2y for output F_DO y (y = 0..3) for test stop.
The state of the LEDs depends on the type of external circuit.
DI 2y
– Off One of the two output lines y+ or y- or both lines of output y have a
signal
–
Green Continuous light Both output lines y+ and y- have no signal –
Service cases - hardware
4.18 Terminal Modules
Software and hardware
Service Manual, 08/2018, 6FC5397-5DP40-6BA1 221
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