Expander Interface Adapter (T8312) Technical Overview

1. Module Role & System Connectivity

The Expander Interface Adapter (T8312) serves as a physical bridge, establishing connections between 

expander interface modules in the controller chassis and processor interface modules in expander chassis. It 

enables scalable expansion of the control system by linking multiple chassis into a unified architecture.

2. Model Variants & Capacity

Two adapter models are available, each supporting different numbers of expander chassis:

T8312/4: Connects up to four expander chassis.

T8312/7 (shown in Figure 5-7): Connects up to seven expander chassis, enabling broader system 

expansion.

3. Physical Design & Interfaces

Mechanical Construction: The adapter features a robust metallic enclosure (visible in Figure 5-7 Expander 

Interface Adapter, Figure 5-8 Expander Interface Adapter (Front View), and Figure 5-9 Expander Interface 

Adapter (Rear View)) to withstand industrial environments.

Connector Layout: The rear view (Figure 5-9) displays multiple dedicated connectors, each corresponding 

to an expander chassis, ensuring organized and reliable physical connections.

4. Chassis Identification & Configuration

To manage multiple connected expander chassis, follow this configuration logic:

Dip Switch IDs: When the controller chassis dip switches are set to ID #1, the first seven expander chassis 

use dip switch IDs 2 to 8. For additional chassis (up to 15 in total, designated 9 to 15 in software), a 

second interface adapter is used, with their dip switches also set to 2 to 8 (mapped to 9–15 in the software 

configuration .ini file, as detailed in Section 8).

Software Mapping: This dip switch and software mapping system ensures each expander chassis is 

uniquely identified, preventing communication conflicts and enabling precise system management.

5. Role in System Scalability

By supporting up to seven expander chassis (via T8312/7), the adapter enables the control system to scale 

horizontally. This scalability is critical for large industrial applications, where distributed I/O and \

processing across multiple chassis improve performance, fault isolation, and maintenance accessibility.

How we deliver

Supply Ability:In stock,within 3 days send the products.

Price:The more you order,the lower price you will get.

Our products is ship with original factory new package.

We will cover our our professional foam protective packaging to keep worldwide shipping no damaged.

We have many couirer partner,like DHL,TNT,FeDex and UPS

The factory will strictly test all the goods before shipment,and the warehouse staff will also check the 

integrity of the product packaging when it is shipped.