2TLC172125M0201, rev. A
10
www.abb.com/lowvoltage
2011-09-20
5 Operation
LED indication
LED
Indication
Description
Input signal on pin-2
LED on Tina
Green
Safety circuit closed (protection OK)
Dynamic signal in
Green-Red (flash)
Safety circuit open (protection OK)
No dynamic signal in or 0 VDC in
Red
Safety circuit interrupted (protection open)
+24 VDC in or safety circuit interrupted
Information output signal attributes
The information output of the unit (pin-5) is set either high (+24 VDC) or low (0 VDC) depending on four different
input signals (pin-2):
Dynamic signal
- Dynamic signal input exist, i.e. the safety circuit is OK up until this unit
No dynamic signal
- Dynamic signal input does not exist, i.e. the safety circuit is interrupted before this
unit.
+24 VDC
- A co24 VDC signal is applied = high (H)
0 VDC
- The pin is connected to 0 VDC = low (L)
The information output signal depends on the input signal according to the table below. Note that if the safety is
interrupted the information output signal is always low (L).
Input signal (pin-2)
Dynamic signal
No dynamic signal
+24 VDC
0 VDC
Info output signal (pin-5)
High
High
Low
High
The delay for switching the information signal output from high to low (H L) and low to high (L H) is given in
the table below.
Info output signal switch
H L
L H
Delay
~ 12 ms
~ 0 ms
NB:
If the unit detects an error (short circuit or interruption) lasting shorter than 13 ms the information output signal
is set to low for 1.2 s (1200 ms) and then set to high again. This does not affect Vital since it needs 38 ms to
release. Pluto however does release, which means that a filter (20 ms) must be implemented if this function is
needed.
Warning!
The information output signal is not a failsafe signal and should
never
be used for the safety purpose(s).
