IS220PSVOH1B, REV E - Servo Control Interface I/O Module

SPECIFICATIONS:

Part Number: IS220PSVOH1B, REV E
Manufacturer: General Electric
Series: Mark VIe
Product Type: Servo Control Interface I/O Module
Number of Inputs: 8
Number of Outputs: 2
Power Supply Voltage: 28 V dc
LVDT accuracy: 1%
RTD types: 10, 100, and 200
Span: 0.3532 to 4.054 V
A/D Converter Resolution: 14-bit
Resolution: 16-bit to 24-bit ADC
Scan time Normal scan: 250 ms
Excitation Current: 0.5mA to 1mA
Input Impedance: High (>10MΩ)
Pulse rate accuracy 0.05%
Magnetic PR pickup signal Generates: 150 V
Operating Temperature: -30°C to +65°C
Maximum Lead Resistance: 15 Ω maximum
Mounting: DIN Rail
Availability: In Stock
Country/Region of Manufacture: United States
Manual: GEH-6721D

FUNCTIONAL DESCRIPTION:

IS220PSVOH1B, REV E is a Servo Control Interface I/O Module manufactured and designed by General Electric as part of the Mark VIe Series used in Distributed Control Systems. The PSVO I/O pack interfaces one or two I/O Ethernet networks with a TSVO servo terminal board. It features a common processor board used across Mark VIe distributed I/O packs and a servo-specific I/O board. Working alongside the WSVO servo driver module, it manages two servo valve position loops with five selectable output currents ranging from 10-120 mA DC. The pack supplies LVDT excitation, supports eight LVDT feedback inputs, and processes two pulse rate signals from fuel flow meters. It connects via dual RJ45 Ethernet ports for input and a DC-62 pin connector for output. Power is supplied at 28 V DC from the terminal board. Diagnostic features include indicator LEDs and an infrared port for local serial communication.

INSTALLATION:

Insert one pack for simplex or three packs for TMR directly into the terminal board connectors. Secure the packs using the threaded inserts near the Ethernet ports, attaching them to a bracket specific to the terminal board type. Adjust the bracket to prevent right-angle force on the DC-62 pin connector; this adjustment is only needed once. Connect the WSVO servo driver assemblies to the J2 48-pin connectors and secure them with four screws. Connect one or two Ethernet cables based on system configuration. The pack operates via either port. If using dual connections, standard practice links ENET1 to the R controller network, though the PSVO independently manages Ethernet operation. Power the packs and drivers using the switches on TSVO: SW3 for R, SW2 for S, and SW1 for T. Verify operation through the indicator lights.

OPERATION:

The processor board connects to an acquisition board tailored to the I/O pack function. When input power is applied, a soft-start circuit gradually increases the voltage to the processor board. Local power supplies activate in sequence, and the processor reset is released. After completing self-tests, the processor loads application code from flash memory, verifying compatibility with the acquisition and terminal boards through board ID information. If matched correctly, it initiates Ethernet communication by requesting a network address via DHCP, using a unique identifier from the terminal board.

Once Ethernet is initialized, the processor configures on-board logic, runs the application, and activates the acquisition board. The application code supports operation with one or two Ethernet connections. When both are used, they remain active simultaneously, ensuring uninterrupted function even if one network fails. Any failure is indicated through the operational network. This approach provides greater fault tolerance than traditional hot-backup systems, where a secondary port activates only after primary failure. The Ethernet ports automatically adjust between 10 MB/s and 100 MB/s speeds and switch between half-duplex and full-duplex modes as needed.

• High-speed processor with RAM and flash memory
• Two fully independent 10/100 Ethernet ports with connectors
• Hardware watchdog timer and reset circuit
• Local ambient temperature sensor
• Infrared serial communications port
• Status-indication LEDs
• Electronic ID and the ability to read IDs on other boards
• Substantial programmable logic supporting the acquisition board
• Input power connector with soft start/current limiter
• Local power supplies, including sequencing and monitoring

BSVO SERVO BOARD:

The BSVO board multiplexes 24 analog channels into a 16-bit A/D converter. The LVDT inputs, and power supply monitoring. The current references for the analog current regulators on WSVO are generated on the BSVO by a 14-bit D/A converter. Excitation for the LVDTs is developed using a D/A converter that outputs a sine wave with a frequency of 3.2 kHz. This is filtered and passed to the WSVO. The board provides signal conditioning for two pulse rate channels and passes the signals to the processor board to determine the pulse rate.

WSVO SERVO DRIVER ASSEMBLY:

The servo driver assembly has a power supply that converts the P28 voltage input to a positive 15 V and negative 15 V output for the servo current regulator circuits. Two servo current regulators are working off the current references from the servo pack. The servo driver circuit has a selection of five configurable gains, and the assembly contains the servo suicide relays and excitation output driver circuits. The three ways to verify servo performance through stroking the actuator are manual, position ramping, and step current. In manual mode, the desired value is entered numerically and the performance is monitored from the trend recorder. Select Verify Position to apply a ramp to the actuator, and select Verify Current to apply a step input to the actuator. The trend recorder displays any abnormalities in the actuator stroke.

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FREQUENTLY ASKED QUESTIONS:

How does the module communicate with the control system?

It connects to the control system through dual RJ45 Ethernet ports, allowing for reliable communication. The module operates over one or both connections and can automatically negotiate network parameters, ensuring efficient and fault-tolerant data transmission.

What servo valve output currents are supported?

The module supports five selectable servo valve output currents, typically ranging from 10-120 mA DC. This range allows it to accommodate various servo applications, providing flexibility in industrial control systems that require precise current regulation.

How is the module secured in the system?

The module is plugged directly into the terminal board and secured using threaded inserts near the Ethernet ports. These inserts connect to a mounting bracket, ensuring proper alignment and preventing stress on the DC-62 pin connector, which maintains long-term reliability.

What speed and modes do the Ethernet ports support?

The Ethernet ports automatically adjust between 10 MB/s and 100 MB/s speeds, depending on the network conditions. They also support both half-duplex and full-duplex communication, ensuring optimal data transmission and compatibility with different network setups.