Yokogawa 414 Batch Controller - Manual (Page 25)

Operation 23
3.5 THE OUTPUT PULSE AND FLOW ALARM
(Model 414D Only)
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.