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Product Introduction
If you are maintaining legacy industrial machinery, finding a drop-in replacement for the CCC MCP-1004 is critical. This module serves as the nervous system interface in older Computer Conversions Corporation control racks, handling the translation between the processor and the physical world via 16 discrete points.The design philosophy here was brute-force reliability. Unlike modern solid-state modules that can fail silently from voltage spikes, this unit relies on mechanical relays. In a dusty textile mill environment we tracked, these relays survived 15+ years of vibration where solid-state alternatives failed every 18 months. It draws minimal power from the backplane (under 2W), meaning you don’t need to recalculate your entire rack’s thermal load when swapping it in.
Key Technical Specifications
- Model Number: MCP-1004
- Brand: CCC
- Channel Count: 16 Points
- Signal Type: Digital I/O (Discrete)
- Operating Voltage: 24 VDC
- Output Type: Relay (Mechanical)
- Contact Rating: 2 Amps (Resistive)
- Isolation: Optical Isolation (Input to Output)
- Operating Temp: 0°C to +55°C
- Status Indicators: LED per channel (Input/Output status)
- Mounting: Standard DIN rail or panel mount
- Compatibility: CCC MCP Series Control Racks
Application Scenarios & Pain Points
The “Ghost in the Machine” Scenario
It is 2 a.m. on a Sunday, and the packaging line has stopped. The operator calls it a “jam,” but the maintenance tech knows the rack light is blinking specifically for the MCP-1004 slot. Without this module, the PLC cannot read the proximity sensor on the conveyor, so it shuts down to prevent a crash. This is the high-stakes environment where having a buffer stock of this specific relay module means the difference between a 20-minute swap and a 3-day production halt while you hunt for NOS (New Old Stock) parts.
Target Industries
- Legacy Packaging Lines: Where 24VDC relays interface with photoelectric sensors and pneumatic solenoids.
- Municipal Water Pumps: The relay output handles the inductive kick from old pump starters better than transistor outputs.
- Automotive Stamping (Pre-2000): Ruggedness is required to handle the EMI noise from giant hydraulic presses.
- Food Processing: The sealed relay design resists washdown moisture better than open PCB connectors.
Case Study: Municipal Water Treatment Retrofit
- The Problem: A regional water treatment plant in the Midwest was facing obsolescence issues with their CCC rack. The MCP-1004 modules were failing due to contact welding (a common relay failure mode), and the OEM had stopped support 10 years prior.
- The Solution: Instead of forking out $50k for a full PLC system upgrade, the plant manager opted for a “like-for-like” replacement strategy. We sourced tested New Surplus units and performed a contact refurbishment in-house.
- The Outcome: By implementing a last-time-buy for 5 modules and training techs on basic contact cleaning, the plant extended its operational life by 4 years, saving enough capital to fund a phased migration to a modern ControlLogix system.
