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GENERAL DESCRIPTION
The Direct Logic 405 Four Loop Temperature Controller CoProcessor integrates into one single slot
module, all the functions of four, single loop temperature controllers. Because the module uses the
DL405 high speed parallel dual port RAM interface, the effect on CPU scan time is minimal.
TEMPERATURE CONTROL
The module provides control outputs and temperature inputs so that precision temperature control is
maintained even while the PLC is in program mode.
Auto tuning of the Controller PID loops provides simple setup and maintenance. Auto tuning easily
adapts to changing process conditions. Because the floating point math intensive temperature
calculations are performed in the Controller, it has little effect on CPU scan time. In most applications,
no supporting ladder logic is required.
The power of the DL405 can be used to enable features beyond the capabilities of most single loop
temperature controllers. For example, minimal additional ladder logic is needed to ramp and soak
SetPoint changes or to change process recipes.
CONTROLLER I/O
The Controller is jumper selectable for direct connection to either RTD or Thermocouple temperature
sensors.
On board solid state outputs are used to cycle heater or cooler relays using either time proportioning
(pulse) PID or ON/OFF control logic. The controller output is also placed in the PLC for optional use with
DL405 4-20 mA or voltage linear analog output modules.
A current transformer is connected directly to the Temperature Controller to provide heater burn-out
detection.
User field wiring is made to a removable socket type terminal block on the controller's face plate. Thus
the temperature controller can be easily removed or changed without removing the field wiring.
OPERATOR INTERFACE
All Temperature Controller parameters are placed in V-Memory so that configuration, operation and
monitoring are easily adapted to the needs of every application. Temperature values are in engineering
units, either EC or EF.
Users
An intelligent Operator Interface Terminal or industrial computer connected to either port
on a DL405 CPU can be used to change SetPoints and monitor operation.
A single OIT can service one or several DL405 systems using the 25 pin DirectNET
network port on 405 CPU.
OEMs
The temperature SetPoint in V-Memory may be easily changed via a Hand Held
Programmer or an attached operator interface.
CHAPTER 1: INTRODUCTION
1.1
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