WhatsApp: +86 16626708626
Email: 
Phone: +86 16626708626Description
Key Technical Specifications
| Parameter | Value |
| Manufacturer | AutomationDirect / Koyo |
| Part Number | D4-32TD2 |
| PLC Compatibility | DirectLogic DL405 Series Base Units (D4-430, D4-440, D4-450, D4-454 CPUs) |
| Number of Points | 32 Discrete Outputs |
| Output Type | Transistor (Current Sinking / NPN) |
| Operating Voltage Range | 12 to 24 VDC (10.2 to 26.4 VDC limit) |
| Peak Voltage | 30 VDC |
| Max Load Current | 0.2 A per point (1.6 A per common group, 6.4 A total per module) |
| Off-State Leakage Current | 0.1 mA max at 26.4 VDC |
| ON Voltage Drop | 1.5 VDC max at 0.2 A |
| Commons & Isolation | 4 isolated commons (8 points per common group); 1500V optical isolation |
| Response Time | OFF-to-ON: < 0.2 ms | ON-to-OFF: < 0.5 ms |
| Connector Type | Standard 40-pin header (Requires ZIPLink cable or D4-16C-C connector) |
| Base Power Consumption | 320 mA max from 5 VDC base power |
Product Introduction & Application Context
The AutomationDirect D4-32TD2 is a 32-point, high-density current sinking (NPN) transistor discrete output module designed for the DirectLogic DL405 PLC platform. It allows a DL405 CPU or expansion rack to control up to 32 separate 12–24 VDC low-power industrial devices—such as pilot lamps, small solenoid valves, pneumatic actuators, and intermediate control relays.
Featuring 1500V optical isolation between system logic and field wiring, the D4-32TD2 protects CPU backplane electronics from field-side electrical noise, voltage spikes, and ground loops. High-density 32-point modules save valuable rack slot space by providing 8-point grouping per isolated common across a single slot using a 40-pin high-density connector interface or pre-wired ZIPLink cabling systems.
Replacement & Installation Steps
1.Stage 1: Pre-Installation Preparation:Safety & LOTO.
Execute Lock-Out/Tag-Out (LOTO) on main cabinet control power and field circuit breakers. Disconnect all external 12–24 VDC auxiliary power sources supplying the output commons.
Verification: Confirm 0.0 VDC across the output supply terminals using a calibrated digital multimeter before proceeding.
2.Stage 2: Removing the Existing Module:Module Removal.
Unlatch the 40-pin wiring connector header or ZIPLink cable assembly attached to the front of the D4-32TD2. Press the top and bottom retaining clips on the module housing inward, then pull the module straight out from the DL405 base rack slot.
Verification: Inspect the backplane slot edge connectors for bent pins, debris, or thermal damage.
3.Stage 3: Module Seating & Reconnection:Seating & Wiring.
Align the replacement D4-32TD2 module with the rack guide rails. Firmly slide the module into the base until the top and bottom lock levers snap into place. Re-attach the 40-pin field wiring connector header and tighten any securing screws.
Verification: Ensure the module is flush and securely locked into the DL405 base chassis.
4.Stage 4: Power-Up & Operational Check:Commissioning.
Re-apply CPU logic power and external 24 VDC field load power. Put the DL405 CPU in RUN mode or force individual outputs via DirectSOFT programming software.
Verification: Confirm that the front-panel output status LEDs illuminate when energized and that field devices respond without triggering rack fault conditions.
D4-32TD2
D4-32TD2
Wiring & Deployment Best Practices
- Sinking (NPN) Output Wiring: The D4-32TD2 is a sinking module. The output point switches the load to field DC ground (0V). Connected field devices must have their positive lead (+24V) tied directly to the DC power supply, while their negative return connects through the D4-32TD2 terminal point.
- Flyback / Inductive Suppressors: When switching inductive loads (solenoids, contactors, magnetic clutches), install flyback diodes across the load to absorb voltage spikes and prolong transistor lifecycle.
- ZIPLink Wiring Solutions: To eliminate manual wiring error points on the 40-pin connector, utilize pre-wired AutomationDirect ZIPLink cables (e.g., ZL-D4-CBL40) and feed-through breakout terminal blocks (e.g., ZL-RTB40).
Frequently Asked Questions (FAQ)
What is the difference between D4-32TD1 and D4-32TD2?
The D4-32TD1 is a current sourcing (PNP) module (+24V output switching). The D4-32TD2 is a current sinking (NPN) module (GND output switching). Choosing the wrong model will cause polarity mismatch with field sensors and devices.
Does the D4-32TD2 include internal fuses?
No. The D4-32TD2 module does not have built-in fused output circuits. External fusing on each common line or individual field point fusing is strongly recommended to protect output transistors from direct short circuits.
Can I mix different voltages on the four common channels?
Yes. Each of the 4 commons (8 points per common) is galvanically isolated from the others. You can run separate 12 VDC and 24 VDC power supplies on different commons within the same module if required.
Can I hot-swap this module while the PLC rack is powered on?
No. Always turn off base rack power before removing or inserting I/O modules to prevent backplane bus corruption or module damage.
