Mitsubishi CL1PAD1 PLC Power Supply Module – CC-Link IE Field

Mitsubishi CL1PAD1 — Dedicated DC Power Supply Module for CC-Link IE Field Remote I/O Stations

The Mitsubishi Electric CL1PAD1 is a 24 VDC input power supply module engineered exclusively for the CC-Link IE Field Network remote I/O station platform. Within a distributed control architecture, the CL1PAD1 occupies the power slot of a CL1BS-series base unit and converts the externally supplied 24 VDC rail into the regulated internal bus voltage required by all I/O modules mounted on that base. Without a correctly rated power module in this slot, the remote station cannot enumerate on the CC-Link IE Field segment, making the CL1PAD1 a non-optional, safety-critical component in any CL1BS-based field node.

In a typical CC-Link IE Field topology, a master station — such as the RJ71GF11-T2 on an iQ-R rack or the FX5-CCLIEF on an iQ-F system — communicates with remote I/O stations over a 1 Gbps full-duplex Ethernet backbone. Each remote station base (CL1BSIOC, CL1BS04D) requires one CL1PAD1 per base unit to power the local I/O module complement. The module draws from the 24 VDC cabinet supply, isolates the internal logic bus, and distributes conditioned power across the backplane connectors. This architecture ensures that field-side wiring faults — including short circuits on sensor or actuator loops — do not propagate into the backplane bus or corrupt the network communication layer.

The CL1PAD1 is not a general-purpose DIN rail power supply. It is a form-factor-specific module with a proprietary backplane connector keyed to the CL1BS base unit slot. Substituting a generic 24 VDC PSU in this position is mechanically and electrically incompatible. Engineers specifying replacement units must confirm the base unit model number and slot assignment before procurement.

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Technical Parameters

Hardware Logical Analysis

The CL1PAD1 implements a galvanically isolated DC-DC conversion stage between the 24 VDC external supply and the CL1BS backplane bus. This isolation boundary is the primary EMC defense mechanism for the remote I/O station. In industrial cabinet environments, the 24 VDC rail is shared with solenoid valves, relay coils, and motor starters — all of which generate conducted transients in the range of 1 kV to 4 kV (per IEC 61000-4-5 surge immunity test levels). The isolation stage in the CL1PAD1 attenuates these transients before they reach the logic bus, preventing data corruption on the CC-Link IE Field communication layer.

The module’s backplane connector is a multi-pin proprietary interface that carries both power rails and a module-present signal. The CL1BS base unit reads this presence signal during power-on self-test (POST). If the CL1PAD1 is absent or improperly seated, the base unit will not assert its network participation flag, and the master station will log a station disconnection error (error code 0xC070 in GX Works3 diagnostics). This hardware interlock prevents the system from operating with an under-powered I/O station, which could cause indeterminate output states on connected actuators.

Thermal management in the CL1PAD1 relies on natural convection through the module housing vents. The internal switching frequency is selected to minimize core losses at the rated load, keeping the junction temperature of the primary switching element within safe operating limits at the maximum ambient of 55 °C. No forced-air cooling is required under standard load conditions, which simplifies cabinet thermal design and reduces maintenance intervals associated with fan replacement.

The module’s input filter network suppresses high-frequency noise (>150 kHz) conducted from the 24 VDC supply rail, meeting the Class A conducted emission limits of CISPR 11. This is particularly relevant in cabinets where variable-frequency drives (VFDs) share the same DC bus, as VFD switching harmonics in the 10 kHz to 1 MHz range are a common source of I/O module malfunction in field installations.

System Integration Benefits

• Deterministic I/O scan cycle: The CL1PAD1 maintains stable backplane voltage within ±2% under dynamic load changes caused by simultaneous switching of multiple output modules, ensuring the I/O scan cycle completes within the master station’s configured link scan time without voltage-induced delays.
• Fault isolation at the station level: The isolation boundary prevents a 24 VDC field wiring fault from propagating to the CC-Link IE Field network segment, preserving communication integrity across all other remote stations on the same ring or star topology.
• GX Works3 diagnostic transparency: Module health status is reported to the master station via the CC-Link IE Field protocol’s station status word. Engineers can read power module fault flags in real time from the GX Works3 network diagnostics window without physical access to the cabinet.
• Hot-swap compatibility: On supported CL1BS base configurations, the CL1PAD1 can be replaced without powering down the entire remote station, reducing mean time to repair (MTTR) in high-availability production lines.
• Consistent power budget across base variants: Whether the base unit hosts digital input, digital output, or analog I/O modules, the CL1PAD1 provides a uniform power interface, simplifying BOM management for multi-station installations with mixed I/O types.
• Reduced cabinet wiring complexity: Because the CL1PAD1 distributes power internally via the backplane, no individual power wiring to each I/O module is required. This reduces terminal block count, wiring labor, and potential connection failure points within the cabinet.
• Compliance with IEC 61131-2: The module’s electrical characteristics conform to the programmable controller hardware standard IEC 61131-2, ensuring compatibility with system-level safety and EMC validation documentation required for CE-marked machine installations in the EU.
• Long-term availability alignment: The CL1PAD1 is part of Mitsubishi Electric’s CC-Link IE Field product family, which is actively supported under the MELSEC iQ-R and iQ-F platform roadmap, providing procurement teams with confidence in multi-year spare parts planning.

Quality Assurance & Global Logistics

Every CL1PAD1 unit supplied by siemensplc.com is sourced as genuine Mitsubishi Electric factory-manufactured hardware. Each module undergoes incoming inspection covering label authenticity verification, connector pin integrity check, and functional power-on test before being added to available stock. Units are stored in ESD-safe packaging in a climate-controlled warehouse in Xiamen, China, maintaining storage conditions within Mitsubishi’s specified -25 °C to +75 °C range.

Shipment from Xiamen reaches major industrial hubs on the following typical transit schedules: Southeast Asia (2–4 business days via DHL Express or FedEx International Priority), Europe (3–5 business days), North America (3–5 business days), Middle East and South Asia (3–6 business days). All shipments include a commercial invoice with HS code 8538.90 for customs clearance, and export documentation is prepared in compliance with Chinese customs regulations for industrial electronic components.

A 12-month warranty from the date of shipment covers manufacturing defects and functional failures under normal operating conditions as defined in the Mitsubishi CL1PAD1 hardware manual. Warranty claims are processed via email with photographic evidence of the defect; replacement units are dispatched within 3 business days of claim approval. Traceability documentation including batch records is available upon request for customers with ISO 9001 or IATF 16949 quality management requirements.

Contact Information

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📍 Location: Xiamen, China
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