User manual

Toolbox 32 User Manual 1.47d www.cse-semaphore.com/mykingfisher
Page
9
Setting Up Low Power Operation *
In addition to controlling output voltages, the LP-2/3 can be put to sleep. This
results in very low power consumption. The LP-2/3 can also count pulses (from
digital inputs 1 and 2) while remaining in subactive sleep mode.
In Sleep mode:
• LED flashes every four seconds
• Analog inputs are disabled
• Analog output (LP-3 only) is reset to zero
• Digital outputs 1 and 2 (relay) hold last state
• Ports 1 to 4 are disabled (a port 1 CTS change can still wake the RTU)
• 5V Out, V1 Out and 24V Out are disabled
• The CPU is placed in sleep mode for a configurable time interval (IO and
communications are no longer processed and ladder logic is stopped)
• Pulses can be counted from digital inputs 1 and 2 while remaining in
Subactive sleep mode. Note: CPU 5V Out is still enabled during Subactive
sleep mode and can be used to power digital inputs 1 and 2.
The RTU will wake up when:
#
• The sleep time has expired
• A serial cable (with a CTS/RTS loop) is connected or removed from port 1
(default setting)
• Digital input 1 or 2 become active (if enabled before entering sleep mode)
Configuration:
Sleep mode is configured using the two parameters #YPDTIME and #YPDSTAT.
#YPDSTAT is defined differently for LP-x RTUs than for other types of Kingfisher
RTUs as follows:
#YPDSTAT Wakeup Conditions (integer read/write)
Ch 1 Time wakeup (default setting. Always set when #YPDTIME is
set)
Ch 2 Digital input 1 change of state
Ch 3 Digital input 2 change of state
Ch 4 Not Used
Ch 5 Port 1 CTS change (default setting)
Chs 6-15 Not Used
Ch 16 Subactive sleep mode. The LP-2/3 remains in sleep mode while
counting pulses from digital inputs 1 or 2. Eg. Can enter
subactive sleep mode by writing 16#8010 (8010 Hex) to
#YPDSTAT (this will allow the LP-2/3 to count pulses and will
also enable wakeup on port 1 CTS change). 5V Out, V1 Out
and 24V Out are also disabled in this mode.
An RTU is put to sleep by setting #YPDTIME (seconds of power down). The LP-x
will then wakeup when the sleep time has expired or port 1 has a CTS change by
default. Other wakeup conditions can be used by writing to #YPDSTAT before
setting #YPDTIME. When woken up, the RTU clears #YPDSTAT and then sets
the channel corresponding to the wakeup event (#YPDTIME is also cleared on
wakeup).
* An LP-2/3 does not use the IO Power Saving Control settings of the System Parameters (as configured in
Configuration, System Parameters) and must be configured for low power operation using ladder logic.
#
If the above wakeup conditions have not been set, the RTU can be interrupted from sleep mode by powering down the
RTU (by disconnecting the input supply) and removing the SRAM battery link (LK1) for 5 minutes (this will clear the
RTU’s configuration).