Automation Direct D4-450 - CPU Module
D4-450
D4-450
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- Return for a refund within: 30 Days*
- Return for replacement within: 30 Days
- *Restocking Fee Applies
Introduction
D4-450 is orderable as:D4-450
The D4-450 CPU can process up to 16 PID loops directly in the CPU. You can select from various control modes including automatic control, manual control, and cascade control. There are a wide variety of alarms including Process Variable, Rate of Change, and Deviation. The various loop operation parameters are stored in V-memory, which allows easy access from operator interfaces. Setup is accomplished with our DirectSOFT Programming Software. An overview of the various loop specifications and features is on page 6-13.
Quick Specs
| Memory Size (Words) | 30.8K |
| Module Type | CPU Module |
| On-Board Communications | Ethernet |
| view all specs | |
Full Product Specifications
Download Datasheet| Anti-windup | If the position form of the PID equation is specified, the reset action is stopped when the PID output reaches 0 or 100%. Select adjusted bias or freeze bias operation. |
| Auto Tuning | Open loop step response method and closed loop limit cycle method. |
| Bumpless Transfer I | Bias and setpoint are initialized automatically when the loop is switched from manual to automatic. This provides for a bumpless transfer, which reduces the chance of sharp changes in the output as a result of entering automatic mode. |
| Bumpless Transfer II | Bias is set equal to the Output when the module is switched from manual to automatic. This allows switching in and out of automatic mode without having to re-enter the setpoint. |
| CPU V-memory Required | 32 V-memory locations per loop selected (An additional 32 V-memory locations per loop required if using Ramp/Soak) |
| Error Deadband | Specify an incremental value above and below the setpoint in which no change in output is made. |
| Error Squared | Squaring the error minimizes the effect a small error has on the Loop output, however, both Error Squared and Error Deadband control may be enabled. |
| Gain | Specify proportional gain of 0.01 to 99.99. |
| Limit OUT | Specify a maximum and minimum value for the output range. |
| Limit SP | Specify a maximum and minimum value for allowable setpoint changes. |
| Loop Operation Modes | Loop can be in automatic control, manual (operator) control, or cascade control. PV alarm monitoring continues when loops are in manual mode. |
| Number of Loops | Selectable, 16 maximum |
| PID Algorithm | Position or velocity form of the PID equation. Optionally specify direct or reverse acting, square root of the error and error squared control. |
| Ramp/Soak | Up to 16 steps (8 ramp, 8 soak) per loop, with indication of Ramp/Soak step. |
| Rate | Specify the derivative time, 0.00 to 99.99 seconds. |
| Rate Limiting | Specify a derivative gain limiting coefficient to filter the PV used in calculating the derivative term (0 to 20). |
| Reset | Specify integral time of 0.1 to 99.98 in units of seconds or minutes. |
| Sample Rate | Specify the time interval between PV samples, 0.05 to 99.99 in units of seconds or minutes. If using all 16 loops, the smallest sample rate is limited to either 0.2 seconds or (PLC scan time x number of loops). |
| Square Root PV | Specify a square root of the PV for a flow control application. |
| Step Bias | Provides proportional bias adjustment for large setpoint changes. This may stabilize the loop faster and reduce the chance of the output going out of range. Step bias should be used in conjunction with the normal adjusted bias operation. |
