User manual

Toolbox 32 User Manual 1.47d www.cse-semaphore.com/mykingfisher
Page
133
Example - Low Power Mode
The RTU has two low power modes - IO power saving and power down.
IO power saving mode is configured from Configuration, System Parameters, I/O Power Saving Control. In
IO power saving mode, the RTU can be configured to switch off various output voltages (eg. 24VDC from the
BA-4 and from IO modules such as the AI-10, IO-4 etc) but in this mode the processor (eg. PC-1) keeps
running.
Power down mode switches off the various RTU output voltages and also puts the processor to sleep. This is
advantageous as the processor module uses more than 100mA at +5VDC. Putting the processor to sleep
reduces the current consumption by over half. It is recommended that only one power saving mode be used
- IO power saving or power down.
Power Down mode is controlled from ladder logic using two parameters #YPDTIME and #YPDSTAT (as
detailed in the appendix RTU Data, System Registers). The RTU can be woken up in three ways: the power
down time (#YPDTIME) expires, a cable with a CTS/RTS loop is connected to a configured serial port or a
Wakeup message is received. To wake up the RTU using a cable with a CTS/RTS loop or using a Wakeup
message, the RTU must be told which port(s) to monitor by setting the appropriate bit(s) in #YPDSTAT. An
RTU may then be woken up with a Wakeup message if the initiating RTU has Wakeup RTU From Power
Down Mode? checked in the network link for the powered-down RTU.
The example below shows how an RTU is put to sleep for 50 minutes at five minutes past the hour. The RTU
will wake up after 50 minutes or if a serial cable with a CTS/RTS loop (eg. an RJ45 cable with an ADP-05
adapter) is connected to ports 1 or 2 or a Wakeup message is received on ports 1 or 2.
│ │
├At 5 mins past the hour, go to sleep for 3000s (50 mins) ┤
│ │
├Wake up if a serial cable is connected to port 1 ┼ ┤
│ │
├or if a wakeup message is received on port 2. ┼ ┤
│ │
│If 5pastHr If Secs=0 SlpFor3000s │
│ #YMIN #YSEC #YPDTIME │
├─────[=]──────────[=]───────────────────────────────────────────┬───(Copy)────┤
│ 5 0 │ 3000 │
│ │CheckP1&P2 │
│ │ #YPDSTAT │
├ ┼ ┼ ┼ ┼ └───(Copy)────┤
│ 6 │
│ │
Figure: Power Down Ladder Logic