SATEC PM174 Manual - Manual (Page 81)

Chapter 4 PAS
Application Software General Meter Setup
Series PM174 Powermeters 81
Using Control Setpoints
The PM174 has an embedded logical controller that runs
different actions in response to user-defined internal and
external events. Unlike a PLC, the meter uses a simplified
programming technique based on setpoints that allows the
user to define a logical expression based on measured analog
and digital values that produce a required action.
The meter provides 16 control setpoints with programmable
operate and release delays. Each setpoint evaluates a logical
expression with up to four arguments using OR/AND logic.
Whenever an expression is evaluated as “true”, the setpoint
performs up to four concurrent actions that can send a
command to the output relays, increment or decrement a
counter, or trigger a recorder.
The logical controller provides very fast response to events.
The scan time for all setpoints is 1/2 cycle time (8.8 ms at
60Hz and 10 ms at 50 Hz).
To program the setpoints, select General Setup from the Meter
Setup menu, and then click on the Control/Alarm Setpoints
tab.
The available setpoint options are described in the following
table.
Option Range Description
Triggers
OR/AND OR, AND The logical operator for the trigger
Trigger
parameter
See Appendix C The trigger parameter that is used as an argument in
the logical expression
Operate limit The threshold (in primary units) at which the
conditional expression would be evaluated to true.
Not applicable for digital triggers.