Section 5
5.1
RESIDENT CONFIGURATION
A control configuration is a set of instructions which define the blocks to be used, the connections
between them, their internal configuration and the required adjustments.
When the configuration is loaded in the controller, it is stored in the NVRAM (Non Volatile Random
Access Memory), which is re-writable, allowing the user to change the controller configuration at any
moment. If the controller is switched off, the configuration remains in the memory.
When a new configuration is downloaded to the controller, it replaces the old one.
When the CD600 Plus leaves the factory, a program that configures the controller to operate as a
Multi-loop is stored in its NVRAM. This configuration is mostly used in process control applications and
is known as “resident configuration”.
The configuration’s name is “4 LOOPS” and the main characteristics are:
- Execution of 4 independent control loops;
- The control block of each loop can be configured as PI.D, PID, I.PD or PI SAMPLING. These
blocks can also work with adaptative gain;
- Each loop may have Local Adjustment Setpoint or Remote Setpoint for ratio control. The ratio
constant may be adjusted by the front panel for each loop, independently;
- The SP, PV, MV, PV totalization ratio and present alarm messages can be seen individually in
the display for each loop;
- Each loop has two points of PV alarm (high or low) and an error alarm with time out, so the
actuation values are independently configurable. For each point, there is a corresponding digital
output;
- For each loop, there is a manual input. When a digital input is actuated, it takes the control to
manual mode. The digital inputs will be actuated, with their respective contacts open;
- Loops 1 and 2 have a dynamic Lead-Lag compensator in the feed forward control.
The other configuration characteristics can be viewed through the Functional Diagram analysis
(Figure 5.1) and the block list for each of the loops (Figures 5.2 to 5.6).
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