ABB Tina 7A Service Manual download pdf (Page 9)

2TLC172139M0201, rev. B 9 www.abb.com/ljokabsafety

2014-11-26

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 constant +24 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



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).

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ABB Tina 7A Service Manual Page 9