Yokogawa 414 Batch Controller - Manual (Page 25)

3.5 THE OUTPUT PULSE AND FLOW ALARM
An OUTPUT PULSE is available on terminal 10 for driving remote counters
and produces a pulse each time the Accumulated Total increments by one digit.
For example, if the Accumulated Total has a resolution of 0.01 litres, a pulse is
produced each 0.01 litres.
The pulse is a current sinking pulse of approximately 10mSec produced by an
open collector transistor. The maximum pulse rate is limited to 49 pulses per
second and the resolution on the accumulated total must be set so that the
accumulated total increments at less than 49 counts per second.
Note that due to the uneven pulse output spacing on this output, the pulse output
cannot be used to drive rate indicators.
The FLOW ALARM uses an identical circuit to the Output Pulse, and is on
terminal 7.
The Flow Alarm will output an alarm condition if the flow times out during a
batch (ie. there is no flow registered for a time greater than the Signal Timeout
period, providing the Signal Timeout is greater than 0).
The Flow Alarm output will switch "on" (ie the signal goes low) whenever an
alarm condition exists. The Alarm will switch "off" (ie the signal goes high)
when the alarm is reset by pressing the STOP key.
Operation 23