7 – RELAY OUTPUT
Two mechanical control outputs are available to control relays or valves. Relay 1 is always used as the main batch control
relay, its function cannot be determined.
The second relay as well as the three transistor outputs can be used for the desired function:
• Batch: the function is equal to relay 1.
• Preclose: used for two-stage control. See SETUP 75.
• LO flow alarm: switched once a low flow rate alarm has been triggered. See SETUP 42.
• HI flow alarm: switched once a high flow rate alarm has been triggered. See SETUP 43.
• No-flow alarm: switched in case a no-flow is triggered. See SETUP 41.
• Any flow alarm: switched in case a flow rate or no-flow alarm will be triggered.
• Pre-warn: to generate a switch signal at X-volume before end-of batch. See SETUP 75 and 76.
• Pulse: for use as a scaled pulse output. See SETUP 77 and 78.
• End of batch: will switch on at the end of a batch till a next batch is started (so reverse to the batch process).
RELAY 2
71
Function according to:
batch / preclose / HI flow rate alarm / LO flow rate alarm / no-flow alarm / any flow alarm / pulse /
pre-warn / end of batch / off
TRANSISTOR 1
72
Function according to:
batch / preclose / HI flow rate alarm / LO flow rate alarm / no-flow alarm / any flow alarm / pulse /
pre-warn / end of batch / off
TRANSISTOR 2
73
Function according to:
batch / preclose / HI flow rate alarm / LO flow rate alarm / no-flow alarm / any flow alarm / pulse /
pre-warn / end of batch / off
TRANSISTOR 3
74
Function according to:
batch / preclose / HI flow rate alarm / LO flow rate alarm / no-flow alarm / any flow alarm / pulse /
pre-warn / end of batch / off
PRECLOSE QUANTITY
75
According to the setting Preclose, the switch moment of the output is based on the remaining
quantity before the end of batch.
With value zero (0) this function is disabled.
PREWARNING
76
According to the setting Pre-warn, the output will be switch at the moment of Preclose during
X- seconds.
This time can be set in the range: 0.1…999.9 seconds.
PULSE WIDTH
77
The pulse width determines the time that the output will be switched; in other words the pulse
length. This pulse length determines also the maximum frequency based on a 50/50 duty cycle.
Maximum frequency = 1 / 2*pulse length (in seconds)
The pulse width is set in milliseconds in the range 0.001…9.999 seconds.
Value “zero” disable the pulse output.
OTE:N If the frequency should go out of range—when the flow rate increases, for example—an
internal buffer will be used to store the missed pulses: As soon as the flow rate slows
down, the buffer will be emptied. It might be that pulses will be missed due to a buffer-
overflow, so it is advised to program this setting within its range!
IMPULSE PER
78
A pulse will be generated every X-quantity.
Enter this quantity while taking the displayed decimal position and measuring unit into account
(according to PRESET).
PULSE ACCORDING
ACC. TOTAL / BATCH
79
This function determines if a pulse will be generated according the quantity batched or according
to accumulated total.
With setting BATCH, the pulse generator will be set to zero when a new batch is started up (and
does not reflect the complete totalized volume).
Table 9: Relay output
Industrial Process Controller, Model PC200
Page 26 April 2017CTL-UM-00483-EN-07
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