Binary Inputs; Alarm And Tripping Inputs - Siemens 7SR224 Technical Manual

7SR224 Argus Applications
1.2

Binary Inputs

Each Binary Input (BI) can be programmed to operate one or more of the relay functions, LEDs or output relays.
These could be used to bring such digital signals as Inhibits for protection elements, the trip circuit supervision
status, autoreclose control signals etc. into the Relay.
1.2.1

Alarm and Tripping Inputs

A common use of binary inputs is to use the 7SR224 to provide indication of alarm or fault conditions from an
external device which does not itself provide indication or recording facilities. The Binary Inputs are mapped to
LED(s), waveform storage trigger and binary outputs. Note that external device outputs which require high speed
tripping, should be wired to a binary input to provide LED indication and also have a parallel connection wired to
directly trip the circuit via a blocking diode, see fig. 1.2-1:
Figure 1.2-1 Example of External Device Alarm and Trip Wiring
©2010 Siemens Protection Devices Limited Chapter 7 Page 5 of 50