Detailed Product Description of XYCOM XVME-224
 I. Product Overview

The XVME-224 is a 6U dual-high VMEbus 16-channel isolated digital output module launched by XYCOM (now part of Acromag/Xembedded). It is specifically designed for medium-density switch control in industrial environments, used to drive relays, solenoid valves, indicator lights, small contactors, etc. It features high isolation, strong drive capability, safe shutdown, and status reading capabilities, and is compatible with VME architecture industrial control and testing systems. This module has been officially discontinued, and the market circulation is mainly composed of second-hand, refurbished, and inventory spare parts. The standard order number is 70224-001. Core positioning

As a VMEbus slave device, the XVME-224 emphasizes "16 independent isolated outputs + relay-level drive + power-on safety shutdown + channel status readback". It offers balanced density and drive capability per slot, suitable for scenarios where 32 channels are not required but single-channel reliability and isolation performance are emphasized. It is widely used in the maintenance and upgrade of old VME systems. 

II. Core Functional Characteristics

1. Standard VMEbus Interface (Fully Compatible Design)

Complies with the IEEE 1014 VMEbus specification, compatible with all 6U VME enclosures and backplanes, operating in device mode. The address space uses A16 (64KB), with a fixed 1KB address window, and the base address is flexibly configured through onboard jumpers at the 1KB boundary to avoid system address conflicts. The data width supports D08/D16, compatible with 8-bit and 16-bit data transmission, and is suitable for VME master controllers of different bit widths. Backplane connection requires P1 and P2 connectors, compatible with the standard of dual-height VME modules, without interrupt function, focused on output control.

2. 16-channel Isolated Digital Output Channels (Core Function)

Provides 16 independent digital output channels, with a single module achieving parallel drive of medium-density actuators, compatible with relays, solenoids, indicator lights, small contactors, etc. of on-site equipment. Uses channel-level optocouplers for isolation, with isolation voltage up to 300VDC (between channels, between channels and bus ground), effectively blocking industrial site ground potential differences and electromagnetic interference, protecting the system bus and enhancing drive stability.

The output circuit is of open-collector structure, with a maximum load of 30VDC and 150mA per channel. The driving capability is superior to that of the same series XVME-220 (100mA), and can directly drive most industrial relays and solenoids without additional driver modules. All channels integrate transient suppression diodes to absorb high-voltage spikes when inductive loads are disconnected, preventing module damage; it also has reverse polarity protection to prevent external power supply reverse connection from burning out the channel.

3. Power-On/Reset Safe Shutdown Design

The module has a hardware default safety mechanism: when the system powers on, hardware resets, or software resets occur, all output channels automatically forcibly shut down (high-impedance state), preventing accidental actions during power-on that may cause equipment failures or safety risks, complying with industrial safety control specifications, especially suitable for high-risk equipment control scenarios.

4. Output Status Readback Function

Supports software readback of output status, capable of reading the current output level of 16 channels via the VME bus, facilitating real-time monitoring of actuator status, diagnosing line faults (such as open circuits, load short circuits), achieving control loops, and enhancing system reliability and maintainability.

5. Industrial-grade High Reliability Design

Standard operating temperature range: 0℃ to +70℃, storage temperature range: -40℃ to +85℃, compatible with industrial sites, outdoor equipment, etc. The anti-vibration and anti-shock capability meets industrial standards, capable of withstanding 1g (10–100Hz) vibration and 15g impact, suitable for vibration scenarios during equipment operation. EMC performance complies with standards, certified by CE/FCC Class A, the circuit board uses gold-plated gold fingers and shielding design, reducing electromagnetic interference. Low power consumption, typical operating power consumption +5V@1.0A (approximately 5W), low heat generation, compatible with enclosed enclosure environments.

6. Panel Status Indicator Lights

The front panel is equipped with multiple sets of LED indicator lights, providing intuitive display of module operation and channel status: the POWER indicator light is always on when the power is normal; the RUN indicator light is always on when the power-on self-test passes and the module is running normally; the CH0–CH15 ACT indicator lights are lit when the corresponding output channels are conducting (low level), facilitating rapid troubleshooting of channel status on-site.

III. Hardware Specifications Details

Bus Interface Specifications

Bus Protocol: IEEE 1014 VMEbus, device mode;

Address Space: A16 (64KB), 1KB window, jumper configuration for base address;

Data Width: D08/D16; Support interruption: None;

Backplane interface: P1 + P2 connectors;

Size: 6U (160mm × 233.4mm), single slot;

Weight: Approximately 0.65kg.

Output channel specifications

Channel quantity: 16 independent isolated outputs;

Isolation voltage: 300VDC (between channels, channel - bus ground);

Output structure: Open collector (current injection drive);

Maximum load: 30VDC, 150mA (single channel);

Conduction voltage drop: Typical 1V, maximum 1.8V;

Off-state leakage current: Maximum 80μA;

Switching time: Maximum conduction 25μs, maximum turn-off 80μs;

Protection mechanism: Transient suppression, reverse polarity protection, power-on / reset automatic shutdown;

Status readback: Supports software reading of output status.

Electrical and environmental specifications

Power supply: +5V DC ±5%, typical current 1.0A;

Operating temperature: 0℃～+70℃;

Storage temperature: -40℃～+85℃;

Anti-vibration: 1g (10–100Hz);

Anti-shock: 15g;

Humidity: 5%–95% RH (non-condensation).

IV. Typical application scenarios

1. Control of key equipment in industrial automation production lines

Suitable for automotive manufacturing, electronic assembly, food processing, etc. production lines, driving key station solenoid valves, safety relays, alarm buzzers, equipment start-stop contactors, 16 channels meet the medium-scale node driving requirements, high isolation characteristics ensure stable operation in strong electromagnetic environments.

2. Valve and pump control systems in process industries

Suitable for power, chemical, water treatment, etc. process industries, driving on-site switch valves, sewage pumps, cooling fans, fault alarm indicator lights, etc. 150mA single-channel driving capability can directly drive most industrial solenoid valves, no need for intermediate relays, simplifying the system architecture.

3. Upgrade and replacement of old VME control systems

Directly replace faulty or insufficiently performing 16-channel output modules in old systems, without modifying the VME chassis architecture and main program, can upgrade isolation performance and driving capability, suitable for maintenance and upgrade of old VME equipment in semiconductor, military, industrial control, etc. fields, extending equipment service life.

4. High-reliability control for military and aerospace

Complies with MIL-STD-810G environmental standards, wide temperature, anti-vibration, anti-interference design, suitable for high-reliability switch control of relays, indicator lights, small actuators in military equipment, aerospace test systems, 300VDC isolation voltage meets strict electromagnetic compatibility requirements.

5. Automation test platforms and laboratory equipment

Used for industrial automation test platforms, laboratory measurement and control systems, driving test fixtures solenoid valves, test circuit relays, status indicator lights, etc. Output readback function facilitates system closed-loop monitoring, improving control accuracy and fault diagnosis efficiency.

V. Installation and programming key points Installation steps

Preparations: Ensure that the P1/P2 slots of the VME chassis are intact and the +5V power supply is stable; Select an appropriate external power supply based on the load voltage/current, and prepare shielded cables.

Jumper configuration: Set the module base address jumper to avoid conflicts with other module addresses; Disable the interrupt-related jumpers, which is simple to configure.

Module insertion: Align the XVME-224 with the 6U slot and push it in smoothly to ensure that the gold fingers make good contact with the P1/P2 backplane, and tighten the panel fixing screws.

Cable connection: The output channel is an open collector (current injection), connect the load end to the positive pole of the external power supply, and the other end to the output channel of the module; Connect the common end to the negative pole of the power supply; Use shielded cables for long-distance wiring, keeping away from power cables.

Power-on self-test: After the chassis is powered on, the POWER and RUN indicator lights are constantly on, and all CH ACT indicator lights are off (default shutdown); When the software control channel is conductive, the corresponding ACT indicator light is lit, indicating that the module is running normally.

Programming flow (simplified)

Address mapping: Configure the A16 base address, map the module output registers and status read-back registers to the system memory, and establish the CPU and module communication channel.

Output control: Write 8-bit/16-bit data to the output register, with each bit corresponding to a channel, "0" for conduction (drive the load), "1" for disconnection (high resistance), and support byte/word format access.

Status read-back: Read the status read-back register to obtain the current output status of 16 channels, compare it with the control instruction, and diagnose channel faults or line abnormalities.

Reset operation: When the system is reset or software is reset, the module automatically clears the output register, all channels are turned off, ensuring safety.

Six. Core advantages

1. Medium density + strong drive, balancing efficiency and performance

16 independent isolated outputs, single channel 150mA driving capacity, balancing density and driving capacity, no need for additional drive modules, saving costs and slots.

2. 300VDC high isolation, strong anti-interference ability

Channel-level optocoupler isolation, effectively blocking ground potential difference and electromagnetic interference, protecting the system bus, suitable for harsh industrial environments.

3. Power-on safe shutdown, risk controllable

Hardware forced power-on / reset shutdown, avoiding accidental actions, in line with industrial safety standards, reducing equipment damage and safety risks.

4. Output status read-back, high reliability

Support software read-back of output status, achieving control loop, facilitating fault diagnosis and status traceability, improving system maintainability.

5. Industrial-grade reliability, long-term stable operation

Wide temperature, vibration, and anti-interference design, transient protection and reverse protection processes, suitable for industrial sites, outdoors, military, etc., long-term stable operation, low maintenance costs.

Seven. Notes

The module is no longer in production. When purchasing, prefer to choose second-hand / refurbished spare parts with complete test reports, check the model 70224-001 and version, to avoid faulty or incompatible modules.

Output is an open collector (current injection), an external load power supply must be connected,严禁 directly connecting the load to the ground， otherwise it will burn out the channel chip.

When driving inductive loads (such as relays， electromagnetic valves)， a parallel diode (such as 1N4007) must be connected between the load terminals to absorb the reverse electromotive force and protect the module channel.

Field wiring requires using shielded cables， grounding the shield layer at one end； keep away from strong interference equipment such as frequency converters， motors， etc.， to reduce the impact of electromagnetic interference on signals.

Operating temperature 0℃～+70℃， when installing， ensure good ventilation of the chassis， avoid heat accumulation； in high-temperature environments， it is recommended to reduce the channel switching frequency to extend the module lifespan. During installation and maintenance, proper static protection measures must be taken. Wear anti-static wristbands and operate on an anti-static workbench to prevent static electricity from damaging the chips.