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PD6210 Analog Input Batch Controller Instruction Manual
36
Sample Relay Operation
The sampling function allows the operator to set a set point for a “sampling” relay. This can be done for
the rate, total, or grand total. Each time the relay reaches the set point, it will close that relay’s contacts
for a programmed period of time
A rate sampling relay will activate for the sample time (
sam t
), up to 600.0 seconds, every time the set
point rate is reached.
A total sampling relay will activate for the sample time (
sam t
), up to 600.0 seconds every time the
process has batched the amount programmed for the set point, and every time this amount has been
batched afterward. (See the diagram below for more details). The utility of this function can, of course, be
expanded beyond sampling and be used whenever a timed relay output closure is required when the
batch total interval reaches a certain set point.
Relay and Alarm Operation Diagrams
The following graphs illustrate the common operation of the relays, status LEDs, and ACK button.
High Alarm Operation (Set > Reset)
Low Alarm Operation (Set < Reset)
High Alarm with Fail-Safe Operation (Set >
Reset)
Note: Relay coil is energized in non-alarm condition.
In case of power failure, relay will go to alarm state.
Low Alarm with Fail-Safe Operation (Set <
Reset)
Note: Relay coil is energized in non-alarm condition.
In case of power failure, relay will go to alarm state.
Reset
Set
Input
Relay
LED
energized
de-energized
on
off
Autom atic (non-latching)
Reset
Set
Input
Relay
LED
Automatic (non-latching)
de-energized
energized
on
off