10
Connection to a PLC, separate supply
4.3.2 Open Collector Output Operation
The open collector output can be used as a switch or a warning that responds when the process value
moves above or below a set point, or it can be used
to generate a pulsing signal with a rate proportional
to the process value. The output can be disabled if
not used (select “OFF” in the OC OUTPUT menu).
The “parameter” mentioned below could be any of
the three: pH, ORP, or temperature.
Low Mode:
In this mode, the OC output is only active when the
parameter is less than a user set point. The output
will be inactive when the parameter is larger than
the set point plus the hysteresis value.
High Mode:
In this mode, the OC output is only active when the
parameter is larger than a user set point. The output
will be inactive when the parameter is smaller than
the set point minus the hysteresis value.
Proportional Pulsing
In this mode, the OC output will generate a pulse
sequence at the rate defined by the setting in the
OC OUTPUT menu.
In the example below, the starting point is pH=0.00,
the end point is pH=10.00 and the maximum frequency is 200 pulses/min:
• The output will be 0 pulses/min at pH values less than 0.0.
• The output will be 100 pulses/min at 5.00pH.
• The output will be 200 pulses/min at pH values above 10.00pH.
OC
OC
OC
Low Setpoint
Hysteresis
Time
Value
N.O.
N.O.
OC
N.O.
:OC Output Active
:OC Output Inactive
OC
OC
OC
High Setpoint
Hysteresis
Time
Value
N.O.
N.O.
OC
N.O.
:OC Output Active
:OC Output Inactive
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