Description
Product Introduction
The Schneider Electric Modicon 170BDM34600 is a versatile 32-point combination discrete I/O base block for the modular Modicon Momentum platform. Designed to maximize I/O density while saving valuable DIN-rail space, it integrates 16 24V DC inputs and 16 24V DC transistor outputs onto a single physical chassis.
Like all Momentum base blocks, the 170BDM34600 serves as the hardware foundation. It pairs seamlessly with snap-on Momentum Communication Adapters (Modbus TCP, Interbus, PROFIBUS) or Momentum M1 Processor Adapters, making it ideal for distributed control cabinets, machine control skids, and field I/O drops.
Key Technical Specifications
| Parameter | Specification Details |
| Module Type | Discrete Combination I/O Base (16 In / 16 Out) |
| Part Number | 170BDM34600 |
| Manufacturer | Schneider Electric / Modicon |
| Input Specifications | 16 Inputs, 24V DC nominal (11–30V DC operating window) |
| Input Type | Positive Logic (Sink) / IEC 61131-2 Type 1 |
| Output Specifications | 16 Solid-State Transistor Outputs, 24V DC (0.5A per point max) |
| Output Type | Source (PNP Transistor) with short-circuit & overload protection |
| Max Aggregate Output | 8A per module total continuous current |
| Nominal Supply Voltage | 24V DC field supply |
| Isolation Rating | 500V DC Channel Group-to-Bus Isolation |
| Response Time | Input: < 1 ms / Output: < 1 ms off-to-on |
| Status Display | Individual Channel Status LEDs (Inputs 1–16, Outputs 1–16) |
Application Scenarios & Field Experience
The high point density of the 170BDM34600 makes it a favorite for machine builders (OEMs) and panel fabricators looking to manage complete machine subsystems with a single block.
- Conveyor & Packaging Skids: Interfacing 16 photo-eyes/limit switches and driving 16 solenoid valves/indicator lamps from one module.
- Pumping & Valve Manifolds: Reading valve position feedback switches while triggering 24V DC pneumatic directional control valves.
- Compact OEM Machines: Combining all machine digital sensor feedback and actuator drives into a low-profile local panel.
Field Case Study: A bottling plant packaging cell had intermittent output trips caused by inductive voltage spikes from un-suppressed 24V DC solenoid coils. Replacing an aging, degraded base card with a fully tested 170BDM34600—and installing flywheel diodes across the inductive loads—restored solid 0.5A transistor switching with zero output fault dropouts.
Quality Assurance & Testing Procedure
Every surplus 170BDM34600 Momentum base module undergoes a complete hardware diagnostic suite before shipping:
- Visual & Structural Audit: Checking edge-connector pins, DIN-rail mounting latches, and terminal block terminal strip guides.
- Adapter Connection Test: Snapping a test processor/communication adapter onto the top interface to verify backplane bus communications.
- 16-Point Input Toggle Test: Applying 24V DC across all 16 input points individually to verify optical isolation, signal thresholds, and LED indicator light response.
- 16-Point Output Load Test: Applying a 0.5A resistive and inductive load to each of the 16 transistor outputs to verify switching under full current draw, overload thermal response, and LED operation.
- ESD-Safe Packaging: Static-shielded, cleaned, and packed securely in protective foam.
170BDM34600
170BDM34600
170BDM34600
Technical Field Tips & Traps
- ⚠️ Transistor Output Current Limits: Each output channel is rated for 0.5A maximum at 24V DC, with an overall module rating of 8A. Driving larger loads (such as heavy contactors or high-wattage heaters) directly from the module will trip short-circuit protection—use interposing relays for high-current loads.
- ❗ Inductive Load Protection: When switching inductive field loads (solenoids, motor starter coils, DC brakes), always install reverse-biased suppression diodes across the load terminals to prevent back-EMF spikes from prematurely aging transistor outputs.
- ⚠️ Field Power Connections: The 170BDM34600 requires 24V DC power wired to the terminal strip to energize the output switching circuits and input optocouplers. Lack of field 24V DC will cause all outputs to fail to turn on even if the top adapter CPU indicates logic-active status.
- ❗ Top Adapter Dependency: The 170BDM34600 is an I/O base block only. It must be paired with a top-mounted Momentum communication card (e.g., 170ENT11000) or PLC CPU adapter (e.g., 171CCC96030) to communicate over a network.
Frequently Asked Questions
Q: What is the main difference between 170BDM34200 and 170BDM34600?
A: While both are 16-In / 16-Out 24V DC combination modules, the 170BDM34600 features higher current density capabilities and enhanced output short-circuit protection features compared to older revisions.
Q: Are terminal connectors included with the 170BDM34600 base?
A: Momentum bases utilize removable terminal connectors (typically 18-pin screw or spring terminal strips). These can be transferred from your existing module or ordered separately if needed.
Q: Can I use this card with a Modbus TCP Ethernet adapter?
A: Yes! Simply snap a 170ENT11000 or 170ENT11002 Modbus TCP adapter onto the top of the 170BDM34600 base block to turn it into an Ethernet-addressable I/O drop.
Q: Are inputs and outputs isolated from each other?
A: The inputs and outputs are optically isolated from the main internal logic/communication bus (500V DC). Inputs and outputs are grouped with shared common references across their respective field supply terminals.
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