IS220PSVOH1A, REV C - Simplex Servo Control I/O Module

SPECIFICATIONS:

Part Number: IS220PSVOH1A, REV C
Manufacturer: General Electric
Series: Mark VIe
Microprocessor: Intel Celeron 650 MHz
Number of inputs: 8
Power supply voltage: 28 V dc
Memory: 128 MB SDRAM
Number of outputs: 2
LVDT Excitation Output: 3.2 kHz
Programming: Boolean
Product Type: Simplex Servo Control I/O Module
Voltage Range: 14 to 32 V dc
Maximum Lead Resistance: 15 Ohm
Operating temperature: -30 to 65°C
Technology: Surface mount
Size: 8.26 cm high x 4.19 cm
Repair: 3-7 Day
Availability: In Stock
Weight: 2 lbs
Country of Origin: United States
Manual: GEH-6721D

FUNCTIONAL DESCRIPTION:

IS220PSVOH1A, REV C is a Simplex Servo Control I/O Module manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Control Systems. The PSVO I/O pack is the electrical interface between one or two I/O Ethernet networks and a TSVO servo terminal board. It includes a processor board shared across all Mark VIe distributed I/O packs and a dedicated I/O board for servo functions. Using the adjacent WSVO servo driver module, it manages two servo valve position loops with selectable output currents ranging from 10-120 mA DC. Additionally, the pack provides LVDT excitation, supports eight LVDT feedbacks, and processes two pulse rate inputs from fuel flow meters. The pack receives input via dual RJ45 Ethernet connectors and is powered by 28 V DC supplied from the terminal board. Output is delivered through a DC-62 pin connector that interfaces directly with the terminal board. Diagnostic features include indicator LEDs for visual monitoring and an infrared port for local serial communication diagnostics.

OPERATION:

The processor board interfaces with an acquisition board tailored to the I/O pack's function. When input power is applied, a soft-start circuit gradually increases the voltage to the processor board. Local power supplies are sequentially activated, and the processor reset is released. The processor then performs self-tests and loads application-specific code from flash memory. This code verifies compatibility with the board ID to ensure proper alignment between the application code, acquisition board, and terminal board. Once verified, the processor initiates Ethernet communication by requesting a network address via the DHCP protocol, using the unique ID from the terminal board. Following Ethernet setup, the processor configures on-board logic, executes the application, and activates the acquisition board for operation.

The processor application code is designed to support operation with one or two Ethernet inputs. Both network paths remain continuously active when two inputs are used, ensuring uninterrupted I/O pack functionality even if one network fails. Any failure is reported via the remaining active connection, offering greater fault tolerance compared to traditional hot-backup systems, which rely on a secondary port only after detecting a primary port failure. The Ethernet ports on the processor automatically negotiate between 10 MB/s and 100 MB/s speeds, as well as between half-duplex and full-duplex modes. The processor board in the pack is common to all Mark VIe Ethernet I/O packs. It contains the following:

• 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 

INSTALLATION:

• Directly plug one (simplex) or three packs (for TMR) into the terminal board connectors.
• Mechanically secure the packs using the threaded inserts adjacent to the Ethernet ports. The inserts connect with a mounting bracket specific to the terminal board type.
• The bracket location should be adjusted so that no right angle force is applied to the DC-62 pin connector between the pack and the terminal board. The adjustment should only be required once in the life of the product.
• Plug the WSVO servo driver assemblies into the J2 48-pin connectors and secure them with the four screws.
• Plug in one or two Ethernet cables depending on the system configuration. The pack operates over either port. If dual connections are used, standard practice is to hook ENET1 to the network associated with the R controller, however, the
• PSVO is not sensitive to Ethernet connections and negotiates proper operation over either port.
• Apply power to the packs and drivers using the power switches on TSVO. Use
• SW3 for R, SW2 for S, and SW1 for T, and check the indicator lights.

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FREQUENTLY ASKED QUESTIONS:

What is the primary function of the PSVO I/O pack?

The PSVO I/O pack is the electrical interface between I/O Ethernet networks and the TSVO servo terminal board. It supports servo valve position loops, LVDT feedback, and pulse rate inputs from fuel flow meters.

What components are included in the PSVO I/O pack?

The pack includes a processor board common to all Mark VIe I/O packs and an I/O board specific to servo functions. It also uses the WSVO servo driver module for managing servo valve outputs.

What type of input and power connections does the pack use?

Input is received via dual RJ45 Ethernet connectors, and the pack is powered by 28 V DC supplied from the terminal board.

How does the PSVO I/O pack handle output?

Output is managed through a DC-62 pin connector that directly connects to the terminal board.