User manual

905U Wireless I/O Module User Manual
105S Serial I/O Module
Page 64 © October 2001
Hz to match the maximum flow rate of the flow meter. Note that PIN1 has not been configured for
"divide by 10" (for 1000 Hz pulse signals).
• AIN1 (the level transducer) is mapped to AO1 at the 905U-3. The analog debounce has been set to 2
sec. This is because of concern of wave action on the surface of the tank causing un-necessary
change transmissions. This debounce time will also operate on the Pulse Rate value, but as the flow
rate changes slowly, this will not affect the performance of this signal.
• SETPOINT1 (the set-point status for AI1) is mapped to DO2 of #1 (pump station). The set-point
values for this setpoint have been set to 40% and 75%. When the tank level drops to 40%, DO2 at
the pump station will activate to start the pump. When the level rises above 75%, DO2 will reset to
stop the pump.
• The update time for SETPOINT1 has been changed to 5 minute, as required.
• An additional mapping has been entered - LOW VOLT has been mapped to DO7 at #96 via #1
(DO7 at the control station). This mapping is for future use - it will provide a low battery voltage
alarm for the tank station. The update time for this mapping has been set to the maximum time of 15
minutes to reduce loading of the radio channel.
• A Start-up poll has been configured for #1, as DO1 at the tank station is controlled from the pump
station. Note that no comms fail reset time has been configured for DO1. As this output drives an
indication only, the indication will show the last correct status even during communication failures.
Pump Station Configuration
The 905U-1 module has the following configuration :-