The PR445S Weigh Controller is a single weigher, multiple ingredient, weigh controller that may be used in a variety of recipe batch weighing applications. It offers the flexibility of high accuracy automatic ingredient weighing and discharge, along with configurable timer/interlock functions for control of mixing, heating and other process operations from a single weigh controller. Operating from stored recipe data selected through its front panel or from a supervisory PLC or PC system.
Recipe Based Process Control
The PR445S Weigh Controller is able to store up to 50 recipes each of 15 lines. The supported recipe instructions provide a flexible means of controlling both product formulations and process operations. The recipe instructions are sequentially executed and can include both weighing control and process plant control functions. In many cases this eliminates the need for an additional PLC.
Recipes may be entered and edited directly via the front panel or alternatively they may be downloaded via the serial interface from a remote PC using a Configuration Editor package provided by Practicon.
The recipe execution can be started, held and when necessary aborted, by using the three digital inputs provided, either under automatic control from other equipment e.g. a central PLC system, or from external pushbuttons.
In continuous repeat batching applications, an optional batch counter function can be used to set the total number of batches to be produced.
High Accuracy Automatic Ingredient Weighing and Discharge Control
The PR445S Weigh Controller has a built-in load cell amplifier front end allowing it to be connected directly to up to four strain gauge load cells fitted to the weighing system. From this signal and from stored control and calibration data it accurately controls the automatic weighing of target quantities of material.
The weighing control algorithm uses a combination of two speed feeding control, automatic inflight compensation and jogging control in order to minimise weigh cycle time whilst maintaining the maximum possible levels of batch weighing accuracy.
The PR445S Weigh Controller is capable of controlling automatic ingredient weighing of up to 10 ingredients in to a single weigh vessel.
Configurable Weighing Alarm Indication
The PR445S Weigh Controller offers configurable settings for potential weighing alarm conditions that must either alert the attention of an operator or be transmitted to a host system, such as out of tolerance weighments. These alarm conditions are indicated on the local display, switching an associated digital output and via serial communications.
Printed Batch Reports
The PR445S Weigh Controller is able to generate printed batch reports containing time and date stamped ingredient weigh details for each batch produced.
Stored Production Logs
The PR445S Weigh Controller stores a new batch production log at the completion of each batch. These logs comprise of the recipe number, completion time & date, batch number, weighment target and actual figures. The production logs can be later printed, or accessed from a host PC/PLC system via the serial interface.
Network Communication with Host Systems
The software configurable RS232/RS485 serial interface can be used for communication with host PLC or PC systems. The appropriate process data is available to be read, and written where applicable, using the SABus (simple ASCII commands) protocol.
PR445S Weigh Controller Features
- Single or Multiple Recipe Operation, up to 50 recipes each with 15 lines
- Single or Multiple Batch Operation
- High Accuracy Automatic Ingredient Weighing and Discharge of up to 10 ingredients
- Weighing alarm indication with associated digital output
- Timer/Interlock options for control of Mixing, Heating and other process operations
- Configurable Trip Level Options
- Time and Date stamped batch report printing
- Stored Production Logs
- Serial network communications to a host PLC or PC system
- Off-line recipe and configuration editing software including upload/download facility
PR445S Weigh Controller Specification
|PR445S Data Sheet||PR445S - RS232/RS485 serial interface|