Product Details

The XYCOM 81987-001B1805 is a discontinued rack-mounted 1805 series general-purpose I/O control board, designed as the revised B version of 81987-001A1805 and compatible with XYCOM legacy CNC and process automation control racks. It maintains the same mechanical outline and backplane connector definition for direct drop-in replacement, with upgraded circuit layout and optimized noise suppression performance compared with the A revision. This board serves as the universal signal interface between the main controller board and field discrete devices including limit switches, proximity sensors, safety interlock switches, relay coils and solenoid valves, responsible for multi-channel digital input acquisition and digital output drive for auxiliary control and status feedback. The board integrates signal conditioning, contact debounce, surge suppression and noise filtering circuits, which effectively filter transient interference and contact bounce generated by servo motors, inverters and spindle drive units in the workshop, ensuring stable and accurate transmission of switching signals. It exchanges real-time I/O status and control commands with the master CPU through the dedicated backplane bus, supporting flexible logic configuration for equipment interlock, lubrication, cooling, chuck control and safety protection functions. Technicians can configure input polarity, output mode and station address by adjusting on-board DIP switches and jumpers to match different machine tool and process control I/O allocation schemes. The front panel is fitted with LED status indicators for power supply, input signal activity, output trigger and fault alarm, which allows maintenance staff to quickly check signal status, locate wiring faults and verify control logic during commissioning and routine maintenance. The PCB adopts industrial-grade electronic components and complete EMC protection design, capable of resisting vibration, dust and electromagnetic noise in harsh machining and chemical plant environments to maintain long-term continuous operation. This legacy general I/O board is mainly supplied as spare replacement parts for existing XYCOM automation systems. Users need to confirm backplane pin definition, I/O address mapping and host firmware compatibility before installation. A conformal coated version is optional for high humidity, dusty and corrosive industrial sites. This model is widely used in CNC machine tools, production line automation, process auxiliary control and old industrial control system retrofit projects.

This general purpose I/O control board adopts standard single-slot rack board structure. It draws power from the control system backplane. LED indicators display power status, signal activity and fault alarm for convenient on-site inspection. The operating temperature range is 0°C to 50°C, storage temperature ranges from -40°C to 85°C, relative humidity 5% to 95% non-condensing. It complies with industrial shock, vibration and EMC standards and has CE certifications. It supports I/O address and signal configuration backup for fast recovery after hardware replacement.

This XYCOM 81987-001B1805 I/O control board is widely applied in legacy CNC and process control racks and automation equipment upgrade projects. It provides reliable universal discrete signal interaction between the master controller and field devices. As a reliable discontinued spare part, the XYCOM 81987-001B1805 retains original bus timing and signal compatibility, and effectively reduces the renovation cost of legacy industrial control system maintenance.