TM2DRA8RT 8-Channel Relay Output Module Installation & Technical Guide
Product Introduction
The Schneider Electric TM2DRA8RT belongs to the Modicon TM2 series. This module expands your PLC system with 8 relay output channels. Moreover, each channel operates independently with a normally open contact. You can directly interface with indicator lights, small relays, and solenoid valves. Specifically, the TM2DRA8RT replaces older discrete output cards. Its form factor matches the TM2 bus system perfectly. Furthermore, this module requires no external power supply for the logic side. Only the output commons need separate 24V DC or 110V AC power.
Core Value
This module reduces panel space by 30% compared to discrete relays. Firstly, its pluggable terminal blocks speed up wiring and replacement. Secondly, the TM2DRA8RT supports mixed voltage loads. You can switch both AC and DC devices on the same module. Thirdly, LED indicators show each channel’s real-time status. This feature simplifies troubleshooting during machine commissioning. Therefore, maintenance teams prefer the TM2DRA8RT for high-uptime production lines. Additionally, the module withstands 1500V AC isolation between channels and logic. This ensures safety in noisy industrial environments.
Technical Insights
The TM2DRA8RT operates with a typical response time of 10ms. Maximum switching frequency reaches 1Hz under resistive loads. Specifically, each relay contacts rating: 2A (resistive) at 24V DC or 250V AC. For inductive loads, use a 0.1A rating to ensure long life. The module consumes 40mA from the 5V bus. Also, it draws no current from the 24V bus. The operating temperature ranges from -10°C to 55°C. Install the TM2DRA8RT horizontally to meet IP20 protection. Moreover, the module uses 6mm² maximum wire size for output commons. Use copper conductors only.
Installation & Maintenance
Snap the TM2DRA8RT onto a DIN rail. Firstly, connect the 24V DC supply to the right-side bus connector. Secondly, wire output loads between COM and output pin. Thirdly, set the output state to off before inserting or removing the terminal block. For maintenance, regularly check contact oxidation. Specifically, if you switch low-current signals (<50mA), use gold-contact relays. The TM2DRA8RT does not include contact protection internally. Therefore, add external RC snubbers for AC inductive loads. Additionally, use flyback diodes for DC coils. Replace the whole module if any channel fails to actuate. Cleaning requires only dry compressed air.
Buyer’s Guide FAQ
Q1: Which PLC families work with the TM2DRA8RT?
A1: The TM2DRA8RT directly supports Modicon M221, M241, and M251 logic controllers. It also works with any Modicon TM2 bus master.
Q2: Can the TM2DRA8RT switch 220V AC motors directly?
A2: No. Use the TM2DRA8RT to control a contactor coil, not the motor power. Each relay handles only 2A maximum.
Q3: How many TM2DRA8RT modules can I connect to one PLC?
A3: A single Modicon M221 CPU supports up to 11 TM2 expansion modules. Count the TM2DRA8RT as one module in this total.
Q4: What happens if a relay sticks closed on the TM2DRA8RT?
A4: First cycle power to the PLC. If the issue persists, replace the module. Sticking usually indicates contact welding from overcurrent.
Q5: Does the TM2DRA8RT require a separate end plate?
A5: Yes. Always install the TM2XMTGB end plate on the last TM2 module. This secures the bus connection and mechanical assembly.
