Operational Specifications; Alarm Specifications - FACTS Engineering Direct Logic 405 Manual

OPERATIONAL SPECIFICATIONS

Installation Up to 8 Temperature Controllers may be used with a single 405 CPU. Temperature
Controllers must be installed in the CPU base.
V-Memory A slot dependent V-Memory location specifies the starting address of the block of
Block V-Memory to be used by the Temperature Controller.
Loops Up to 4 independent temperature loops can be controlled. A unique V-Memory
location specifies the number of loops which are enabled for each Temperature
Controller.
Algorithm PID control with auto tuning or ON/OFF control with hysteresis.
Limit SP Optionally, specify a high and low limit for allowable SetPoint changes.
Scaling Conversion of the temperature value to engineering units is automatically done by
the Controller.
Gain Specify proportional gain of 0.0 to 6553.5. Gain may be determined automatically by
using the Auto Tuning feature.
Reset Specify reset time of 0 to 65535 seconds. Reset may be determined automatically
by using the Auto Tuning feature.
Anti-windup The reset action is stopped when the PID output reaches 0 or 100%.
Rate Specify the derivative time, 0 to 65535 in units of seconds. Rate may be determined
automatically by using the Auto Tuning feature.
Auto Tune Auto Tune can be programmed to calculate either PID or PI controller settings.

ALARM SPECIFICATIONS

Deadband Specify the temperature deadband on all alarms. The alarm will remain active
while the temperature is outside the alarm limit minus the deadband.
Alarm deadband prevents alarm chatter when the temperature is near the alarm
limit.
Temperature High The Temperature High Alarm is turned on when the temperature rises above the
programmed limit.
Temperature Low The Temperature Low Alarm is turned on when temperature falls below the
programmed limit.
Deviation Specify an alarm for high or low temperature deviation from the SetPoint. When
the temperature is further from the SetPoint than the programmed deviation limit
the Temperature Deviation Limit Alarm is turned on.
Broken Sensor The Broken RTD or Thermocouple alarm is turned on when the a RTD or
Thermocouple is burned-out or missing. It also is turned on when a RTD input is
shorted.
In both cases the indicated temperature will be full scale positive, 3276.7 EC or
EF.
INTRODUCTION 1.3