Weidmuller WI-I/O 9-K: Wireless I/O Transmitter v1.9 User Manual

Page 21

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User Manual v1.9


Manual

WI-I/O 9-K

v1.9

Page 21

Digital input

Update time, off state

1 day

Update time, on state

15 minutes

Input is expected to be on twice per year for 4 hours

No. of change messages per year

=

2 (twice per year) * 2 (on to off and off to on)

=

4

No. of “off” update messages per year

=

364 (approximately)

No. of “on” update messages per year

=

2 (twice per year) * 16 (4 hours @ 15 min update)

=

32

Total messages for digital input

=

4 + 364 + 32

=

400

Pulse input

Update time

1 day

Sensitivity 50

Average pulse rate is 1 pulse per hour, with peak rate of 20 per hour, for 10 hours, three times per year.

No. of change messages (normal rate)

=

0 (time for 50 pulses is more than the update time)

No. of change messages (peak rate) =

3 (three per year) * 200 (20 per hr for 10 hrs) / 50

=

12

No. of update messages per year

=

363 (approx)

Total messages for pulse input

=

12 + 363

=

375

Analog input

Sample time 1 hour

Warm-up time 5 secs

Sensitivity

3%

Update time 1 day

Average changes of >3% is twice per day

No. of change messages per year

=

2 (twice per day) * 365

=

730

No. of update messages per year

=

0 (always be a change message each 1 day)

Total messages for analog input

=

730

Total input messages per year

=

400 + 375 + 730 =

1505

Power consumed in transmissions =

0.005 * 1505 * 2 (2 transmissions per message)

=

15 mAHr per year

Power for analog loop supply (assume average loop current is 12mA)

No. of analog measurements per year

=

365 days * 24 hours * 1(sample time)

=

8,760

Power for analog loop supply

=

0.012 (from above table) * 5 (warm-up time) * 8,760

=

526 mAHr per year

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