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1.5
Binary Inputs
The operation of the binary input(s) can be monitored on the 'Binary Input Meters' display shown in 'Instruments
Mode'. Apply the required supply voltage onto each binary input in turn and check for correct operation.
Depending on the application, each binary input may be programmed to perform a specific function; each binary
should be checked to prove that its mapping and functionality is as set as part of the Scheme Operation tests.
Where the pick-up timers associated with a binary input are set these delays should be checked either as part of
the scheme logic or individually. To check a binary pick-up time delay, temporarily map the binary to an output
relay that has a normally open contact. This can be achieved in the Output Matrix sub-menu by utilising the BI n
Operated settings. Use an external timer to measure the interval between binary energisation and closure of the
output contacts. Similarly, to measure the drop-off delay, map to an output relay that has a normally closed
contact, time the interval between binary de-energisation and closure of the output contacts.
Note. The time measured will include an additional delay, typically less than 20ms, due to the response time of
the binary input hardware, software processing time and the operate time of the output relay.
BI
Tested
DO
Delay
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
©2010 Siemens Protection Devices Limited
7SR242 Duobias Commissioning & Maintenance Guide
Measure
PU
Measured
d
Delay
Notes (method of initiation)
Chapter 6 Page 10 of 57
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