Chassis Overview
The Schneider ASH827103 slot rack provides a rugged backplane housing for Modicon 800 series I/O modules. This passive chassis distributes power and communication signals across all installed cards. It accommodates up to eight modules in a single horizontal row. System integrators use this rack for building scalable distributed control architectures.
Slot Configuration and Module Capacity
This rack offers eight physically identical slots for any combination of digital and analog modules. Each slot uses a 48-pin DIN connector with gold-plated contacts. The backplane supports both standard and high-speed I/O modules without restrictions. You can populate all eight positions with mixed module types simultaneously. This flexibility simplifies custom system design significantly.
Backplane Communication Architecture
The passive backplane carries a 16-bit parallel data bus for fast module communication. It also provides dedicated interrupt lines for time-critical signal processing. The rack includes separate power planes for 5 V and 24 V DC distribution. Each slot receives individual power filtering for noise reduction. This design maintains signal integrity across long backplane traces.
Power Distribution and Current Ratings
The Schneider ASH827103 distributes 5 V DC at 8 amperes total to all slots. It delivers 24 V DC at 4 amperes for field device power requirements. Each slot receives a maximum of 2 amperes from the respective voltage rails. The backplane incorporates resettable fuses for each module position. These protective elements prevent catastrophic damage from short circuits.
Physical Dimensions and Rack Mounting
The rack measures 482 millimeters in width for standard 19-inch cabinet mounting. Its height totals 89 millimeters, occupying 2U of vertical space. The depth reaches 180 millimeters including rear connectors. The unit weighs 1.2 kilograms without any installed modules. Four mounting brackets secure the rack to cabinet rails.
Connector Interfaces and Field Wiring
A front-facing 25-pin D-sub connector provides external power input access. The rear panel features a 15-pin connector for remote I/O extension. Each slot position includes clearly numbered module guides. The rack provides screw terminal blocks for external 24 V DC supply connections. These terminals accept wire gauges from 0.5 to 2.5 square millimeters.
Cooling and Thermal Management
The chassis design allows natural convection airflow through side ventilation slots. It supports forced-air cooling when installing high-power modules. The backplane copper traces dissipate heat efficiently through the metal frame. The rack maintains safe temperatures even with eight modules fully loaded. This thermal capability ensures reliable long-term operation.
Environmental Specifications and Compliance
The rack operates between 0°C and 60°C without forced cooling. It withstands non-condensing humidity from 5% to 95%. The chassis meets UL 508 and CSA 22.2 industrial control standards. It also complies with CE marking requirements for European markets. The enclosure provides IP20 protection for indoor installation only.
Technical Specifications Table
| Parameter | Specification |
|---|---|
| Number of Slots | 8 positions |
| Backplane Bus | 16-bit parallel data |
| 5 V DC Capacity | 8 A total |
| 24 V DC Capacity | 4 A total |
| Max Current per Slot | 2 A |
| Connector Type | 48-pin DIN, gold-plated |
| External Power Input | 25-pin D-sub |
| Remote I/O Interface | 15-pin D-sub |
| Rack Width | 482 mm (19 inches) |
| Rack Height | 89 mm (2U) |
| Rack Depth | 180 mm |
| Weight (unloaded) | 1.2 kg |
| Operating Temperature | 0°C to 60°C |
| Humidity Range | 5% – 95% RH non-condensing |
| Protection Class | IP20 |
| Safety Standards | UL 508, CSA 22.2, CE |
| Wire Gauge Acceptance | 0.5 – 2.5 mm² |
Details
| Weight | 1.2 kg |
|---|---|
| Dimensions | 180 × 89 × 482 mm |
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