MOTOROLA 188987-008R / 188987-008R001 High-Precision Analog I/O Module
MOTOROLA 188987-008R / 188987-008R001 High-Precision Analog I/O Module
Introduction
The MOTOROLA 188987-008R (also identified by its full assembly number 188987-008R001)
is a high-performance Analog Input/Output (I/O) module specifically designed for Distributed Control Systems (DCS) and Programmable Logic Controllers (PLC).
This module serves as a critical interface for translating real-world physical signals (like pressure, temperature, or flow) into digital data that a central processor can interpret.
Built for industrial-grade environments, the 188987-008R series is recognized for its high-resolution 12-bit conversion capabilities and its modular design,
which allows for seamless integration into Motorola’s legacy automation racks.
Technical Parameter Table
| Parameter | Specifications |
| Product Model | MOTOROLA 188987-008R / 188987-008R001 |
| Module Type | Analog Input/Output (AIO) Module |
| Channels | 8 Channels (12-bit mode) / Up to 16 Channels (8-bit mode) |
| Input Signal Range | 0 to 10V DC, 0 to 20mA (Individually configurable per channel) |
| Resolution | 12-bit (5 mV at 10V / 5 μA at 20mA) |
| Conversion Cycle | 8 ms (for 8 inputs + 8 outputs) |
| Input Resistance | Voltage: > 100kΩ / Current: ~330 Ω (Self-protecting) |
| Power Consumption | Low-power industrial design (System-powered) |
| Operating Temp | -20°C to +70°C (Industrial Grade) |
| Protection | Built-in over-current and surge protection for current inputs |
Related Models
MOTOROLA 188987-001: Standard version with fixed input parameters.
MOTOROLA 188987-008R002: Variant with modified firmware for specific DCS timing requirements.
MOTOROLA MVME162 / MVME147: Processor modules frequently used to control these I/O boards.
MOTOROLA AET-3047: The industrial performance control frame often housing these modules.
Application Cases
Process Control & Automation: Real-time monitoring of chemical reaction parameters in refineries and pharmaceutical plants.
Data Acquisition (DAQ): Collecting precise analog telemetry from sensors in laboratory and testing environments.
Logic Execution: Providing the feedback loop necessary for PID control in HVAC and high-pressure manifold systems.
Marine Automation: Used in shipboard engine monitoring systems where vibration resistance and reliable analog signal processing are vital.
Product Advantages and Features
Individually Configurable Channels: Each channel can be set to either voltage or current mode independently, providing extreme flexibility in the field.
High-Resolution Accuracy: The 12-bit (11-bit plus sign) resolution ensures that even minute changes in sensor input are captured accurately.
Self-Protection Mechanism: The current inputs feature a shunt-disabling safety feature that automatically attempts to reactivate every second if an over-current condition occurs.
Modular Integration: Designed specifically for the Motorola DCS family, ensuring plug-and-play compatibility with existing VME and PLC backplanes.
Other Models in the Same Series
MOTOROLA 188987-002: High-density digital input module.
MOTOROLA 188987-003: Relay output module for high-load switching.
MOTOROLA MVME5500: High-speed processor module often paired with the 188987 series in large-scale installations.
Installation and Maintenance
Installation: Ensure the power to the DCS/PLC rack is off. Align the module with the card guides and firmly seat it into the backplane connector. Secure with the front-panel captive screws.
Wiring: Connect analog signals to the front-panel terminal block. For voltage inputs, unused channels should be bridged to improve noise immunity.
Diagnostics: Monitor the onboard LED indicators (if present) for status updates. The software system will typically report “Overflow” if input signals exceed the 10V or 20mA limit.
Maintenance: No periodic calibration is required for the solid-state components, but signal terminal connections should be checked annually for tightness in high-vibration environments.
Unique Product Description
The Motorola 188987-008R001 is more than just a converter; it is the vital link between physical reality and digital precision.
By combining robust self-protection with multi-mode flexibility, it eliminates the need for multiple specialized cards.
Its ability to switch between 12-bit and 8-bit modes allows it to balance speed and accuracy based on the specific needs of your automation loop.
For engineers maintaining reliable, legacy industrial infrastructure, the 188987-008R remains the gold standard for dependable analog signal processing.