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Product Description
The ADM51-2/CE1 is a discrete contact input module developed by Yokogawa for use in distributed control systems and PLC-based architectures. It is designed to reliably acquire ON/OFF status signals from field-level dry contacts and convert them into logic-level inputs for control and monitoring applications.
Engineered for continuous industrial operation, this module offers stable signal detection even in electrically noisy environments. Its compact form factor and DIN rail compatibility allow straightforward installation in control cabinets where space efficiency and maintainability are critical.
The ADM51-2/CE1 is commonly deployed in Yokogawa DCS platforms and compatible PLC systems where dependable digital input acquisition is required for alarms, interlocks, and equipment status feedback.
Technical Overview
The ADM51-2/CE1 supports sixteen independent contact input channels, each optimized for no-voltage or dry contact signals. Internal isolation and filtering help prevent false triggering caused by transient noise or contact bounce.
The module is designed to operate with standard 24 V DC logic levels used across industrial control systems. Input signal timing characteristics ensure accurate recognition of mechanical switch operations and relay outputs.
Key Technical Specifications
- Manufacturer: Yokogawa
- Model: ADM51-2/CE1
- Module Type: Contact / Discrete Input Module
- Number of Inputs: 16 channels
- Input Signal Type: Dry contact (potential-free)
- Rated Input Voltage: 24 V DC (logic reference)
- Input Current Consumption: Approx. 24 mA (module level)
- Isolation: Electrical isolation between channels and system bus
- Minimum Valid Pulse Width: 40 ms
- Maximum Input Frequency: 10 Hz
- Typical Response Time: 10 ms
- Mounting Method: DIN rail
- Dimensions: 120 × 100 × 60 mm
- Weight: 0.3 kg
- Operating Temperature Range: –10 °C to +60 °C
- Operating Humidity: 5–95% RH, non-condensing
Design and Reliability Features
The ADM51-2/CE1 is built to withstand harsh plant-floor conditions. Its internal circuitry incorporates noise suppression and contact debouncing logic, ensuring stable signal interpretation from mechanical switches and relay contacts.
Channel-level isolation minimizes interference between inputs, improving long-term reliability in systems with high electromagnetic interference. The module housing and terminal design support secure wiring and consistent performance over extended service life.
Typical Application Scenarios
In process automation systems, the ADM51-2/CE1 is used to collect status information from limit switches, valve position indicators, and alarm contacts. It is also suitable for machine automation where discrete feedback signals indicate operational states or fault conditions.
Safety-related monitoring, such as emergency stop loops and alarm acknowledgment circuits, can also be supported when integrated into appropriately designed control systems.
Frequently Asked Questions
Q: Can the ADM51-2/CE1 be used with non-Yokogawa PLC systems?
A: While primarily designed for Yokogawa DCS and PLC platforms, it may be compatible with other systems that support the same electrical and communication specifications. System-level compatibility should be verified before integration.
Q: Does this module support wet contact inputs?
A: The ADM51-2/CE1 is intended for dry or potential-free contact signals. External circuitry is required if wet contact signals are used.
Q: Is the module suitable for high-speed input detection?
A: This module is optimized for standard industrial discrete signals. With a maximum input frequency of 10 Hz, it is not intended for high-speed pulse counting applications.
