Binary (Digital) Inputs - Siemens Argus 7SR21 Technical Manual

7SR21 & 7SR22 Performance Specification
1.2.5

Binary (Digital) Inputs

Nominal
19 V DC
V
BI
88 V DC
1.2.5.1 Performance
Attribute
Maximum DC current for
operation
Reset/Operate voltage ratio
Response time
Response time when programmed to energise
an output relay contact (i.e. includes output
relay operation)
Sample Rate
The binary inputs are isolated from earth potential. They have a low minimum operate current and may be set for
high speed operation. Where a binary input is both used to influence a control function (e.g. provide a tripping
function) and it is considered to be susceptible to mal-operation due to capacitive currents, the external circuitry
can be modified to provide immunity to such disturbances.
To achieve immunity from AC interference, a BI pick-up delay of typically one-cycle can be applied.
Unrestricted Page 14 of 68
Operating Range
17 V DC (minimum) to 290 V DC
74 V DC (minimum) to 290 V DC
Value
V = 19 V 1.5 mA
BI
V = 88 V 1.5 mA
BI
³ 90 %
< 7 ms
< 20 ms
Every 5 ms
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