2TLC172121M0201, rev. A
9
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
-
+24 VDC in
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
Low
Low
Low
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
~ 95 ms
~ 80 ms
Warning!
The information output signal is not a failsafe signal and should
never
be used for the safety purpose(s).
