GMC-P7 Packing & Bagging Controller
Quick specs
| I/O & Performance | |
|---|---|
| Inputs | 12 digital inputs, opto-isolated, low-level effective |
| Outputs | 16 digital outputs, open-collector, 500 mA driving / 3 A full load |
| Communication | RS-232 (TXD/RXD/GND) and RS-485 (A/B/GND), MODBUS-RTU, MODBUS-TCP, USB port |
| A/D speed | 24-bit Sigma-Delta, 120 / 240 / 480 / 960 conversions per second |
| Resolution | 1 / 100,000 (max display); input sensitivity 0.02 µV/d |
| Connection | |
| Display | 7-inch resistive touch screen, English |
| Load cell excitation | DC 5 V, 125 mA max (supports 6-wire load cells) |
| Physical & Environment | |
| Power supply | DC 24 V, ~15 W (power filter included) |
| Operating temperature | -10 ℃ to +40 ℃ |
| Operating humidity | ≤90% RH, non-condensing |
| Enclosure | Stainless steel panel-mount; cut-out 213 × 147 mm (+1 mm tolerance), fixed via M3×10 screws on side plates |
| Dimensions | 233 × 168 × 63 mm (W × H × D) |
Applications
- Hopper-fed bagging machines
- Feed and grain packaging
- Chemical powder packing
- OEM bagging machine integration
VARIANTS
Single hopper or dual head: choose the right configuration
The GMC-P7 packing controller is available in two physical configurations. Both share the same chassis, I/O architecture and communication interfaces. They differ in scale capacity and the bagging modes available.
| Specification | GMC-P7-F2 (single hopper) | GMC-P7-FD (dual head) |
|---|---|---|
| Configuration | Single-scale incremental method | Dual-scale increment method |
| Bagging modes | Net, Gross, Jumbo Bag, Servo motor, PLC | Net, Gross, Bulk scale |
| Recipe storage | 20 recipes | 40 recipes |
| I/O | 28 (12 in / 16 out) | 28 (12 in / 16 out) |
| Communication | RS-232, RS-485, MODBUS-RTU, USB | RS-232, RS-485, MODBUS-RTU, USB |
| Display | 7-inch resistive touch screen | 7-inch resistive touch screen |
| Dimensions | 233 × 168 × 63 mm | 233 × 168 × 63 mm (same chassis) |
| Best fit | Single bagging head, mainstream throughput | Dual bagging head, higher throughput, AB separate & combined modes |
How to choose
Choose the F2 for single-head bagging machines, smaller production lines, or where the five filling modes (including Jumbo Bag and PLC supervisor mode) are required.
Choose the FD for dual-head bagging machines, higher throughput, or where dual hopper AB-separate / AB-combined packing modes are needed.
OEM & ODM ready
Built for integration into your line, your machine, or your brand.
As General Measure’s South African partner, R&D Weighing supports OEM and ODM engagements across the controller range. From private-label badging through to custom enclosures, communication protocols, and full system integration with your existing PLC, MES, or ERP environment.
- Private-label finishing & branding
- Custom enclosure & mounting options
- PLC / MES / ERP integration
- Bespoke communication / protocol configurations
- Multi-line synchronisation
- Engineering support throughout commissioning
The OEM packing controller GMC-P7 is a compact panel-mount weighing controller specified by South African bagging machine OEMs for single- and dual-scale packing applications. With F2 single-scale and FD dual-scale variants, integrated coarse/fine cutoff logic and Modbus communication, the GMC-P7 is the cost-effective choice for OEM packing machines that don't need the full 16-point I/O density of the larger GM9907 family.
Panel-mount form factor for OEM machine builders
Bagging machine OEMs need a controller they can specify into their standard machine drawings without redesigning the panel layout each time. The GMC-P7's stainless steel panel-mount form factor, its standard 213 × 147 mm cutout secured by M3×10 screws, its consistent depth behind the panel, and its predictable wiring terminals are what make it the default specification on production bagging machines built for the South African feed, fertiliser and grain handling markets. From the OEM's perspective the controller is interchangeable across product lines, which simplifies spares, training and commissioning.
F2 single-scale and FD dual-scale variants
TEST_BODY_1778866614678 The F2 variant drives a single weigh hopper for one bag-fill station at a time, used on benchtop semi-automatic baggers.
Frequently asked questions
How does the GMC-P7 differ from the GM9907 packing controller?
The GMC-P7 is a compact panel-mount controller for OEM bagging machines that need single- or dual-scale packing without the full I/O density of the GM9907. The GM9907 has 12-16 digital I/O points and supports more complex bagging line topologies (with sewing-station handshakes, stitcher control, more elaborate ticket printing). For a standard single-product OEM bagging machine the GMC-P7 is usually the cost-effective choice.
Is the GMC-P7 suitable for OEM integration in a bagging machine?
Yes. That is its primary market. The panel-mount form factor, standard 213 × 147 mm cutout and consistent terminal layout are designed for OEM specification. The Modbus interface lets the bagging machine PLC (or the GMC-P7 directly) coordinate with downstream conveyors, sewing stations and bag-handling robots without custom integration work.
What is the difference between F2 and FD variants?
F2 is single-scale (one weigh hopper). FD is dual-scale (two parallel weigh hoppers). Choose F2 for entry-level or single-station bagging machines, FD for higher-throughput machines where two parallel hoppers double the cycle rate. The variant is a firmware option, the hardware is the same.
