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Flameproof and intrinsically safe integrated access gateway for mines with multi-protocol signal transmission, PLC control, 8-channel relay output, and Ex db [ib Mb] certification.
The Mining Flameproof and IS Integrated Access Gateway is a new-generation underground communication control access device that ingests field signals of various types through discrete and analog input interfaces, processes them through a programmable controller's internal logic, and outputs control commands to start and stop field equipment — while also enabling data exchange between any two Ethernet communication ports.
Underground mining automation systems generate and consume a diverse array of signal types — discrete on/off states, analog current loops, temperature readings, and digital Ethernet data — that must be collected, processed, and acted upon at the field level. The Mining Flameproof and IS Integrated Access Gateway is designed as the central hub that unifies these heterogeneous signals into a single coherent control and communication platform.
The device accepts three categories of input signals: 8 channels of active switch-value inputs for discrete equipment status, 7 channels of 4–20 mA current analog inputs for continuous process variables (with conversion error ≤2.5% F.S.), and 5 channels of PT100 temperature inputs covering 0 °C to 100 °C (also with ≤2.5% F.S. conversion error). These inputs are processed through the gateway's internal programmable controller, which executes user-defined logic to determine appropriate control responses. The gateway then outputs 8 channels of passive relay contact signals rated at 127 V/1 A, enabling direct control of field equipment or status indication to supervisory systems.
Communication versatility is a defining characteristic of the gateway. It supports Ethernet optical signals (2 channels, SC single-mode dual-fiber, 1310 nm, 100/10 Mbps auto-negotiation), intrinsically safe Ethernet electrical signals (2 channels, 10/100 Mbps auto-negotiation, max 120 m transmission distance), and intrinsically safe RS485 signals (1 channel, 9600 bps, 2 km transmission distance). This multi-protocol capability allows the gateway to interface with virtually any underground device regardless of its communication standard.
A key feature is the integrated 24 V intrinsically safe power output (400 mA, 22–24.5 V), which provides safe and stable power for intrinsically safe sensors and devices — eliminating the need for separate IS power supplies in many installations. The gateway's flameproof-and-intrinsically-safe combined construction (Ex db [ib Mb] I Mb) is housed in a Q235 steel enclosure measuring 582 mm × 374 mm × 742 mm and weighing approximately 130 kg. With a rated input voltage of AC 660 V and input apparent power of ≤150 VA, the device is compatible with standard underground power distribution systems.
| Parameter | Value |
|---|---|
| Explosion Protection | Flameproof + IS (Ex db [ib Mb] I Mb) |
| Housing Material | Q235 steel |
| Dimensions | 582 mm × 374 mm × 742 mm |
| Weight | ~130 kg |
| Rated Input Voltage | AC 660 V |
| Input Apparent Power | ≤150 VA |
| Analog Current Inputs | 7 ch, 4–20 mA, error ≤2.5% F.S. |
| Active Switch-Value Inputs | 8 channels |
| PT100 Inputs | 5 ch, 0–100 °C, error ≤2.5% F.S. |
| Passive Relay Outputs | 8 ch, 127 V/1 A |
| 24 V IS Power Output | 400 mA, 22–24.5 V |
| Ethernet Optical Signal | 2 ch, SC single-mode, 1310 nm, 100/10 Mbps |
| IS Ethernet Electrical | 2 ch, 10/100 Mbps, max 120 m |
| IS RS485 Interface | 1 ch, 9600 bps, 2 km |
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