IS220PAOCH1A, REV J - PAOC Analog Output Module

SPECIFICATIONS:

Part No: IS220PAOCH1A, REV J
Manufacturer: General Electric
Function: PAOC Analog Output Module
Series: Mark VIe
Input voltage: 125 V
Input Span: 1 - 5 Vdc
Input Converter Resolution: 16-bit A/D Converter
Common Mode Voltage Range: 5 V
Scan Time: 5 ms
Total Output: 400 W
Total Output Power: 400 W
Output Voltages: +5, �12, �15, �28 V DC
Temperature: 30 to 66�C
Technology: Surface Mount
Board Size: 8.26 cm High x 4.19 cm Wide x 12.1 cm Deep
Availability: In Stock
Country of Origin: USA
Manual: GEH-6721D

FUNCTIONAL DESCRIPTION:

IS220PAOCH1A, REV J is a PAOC Analog Output Module manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The PAOC serves as the electrical interface between one or two I/O Ethernet networks and an analog output terminal board. It includes a processor board common to all Mark VIe distributed I/O packs and a specialized acquisition board pair for analog output functions. The pack supports up to eight simplex 0-20 mA current loop outputs and features an analog-to-digital converter for current feedback. Inputs are received via dual RJ45 Ethernet connectors and a three-pin power input, while outputs are transmitted through a DC-37 pin connector linked to the terminal board. Visual diagnostics are provided by indicator LEDs, with local diagnostics accessible via an infrared port.

COMPATIBILITY:

The PAOCH1A is compatible with the TBAOH1C analog output terminal board and the STAO board, but not with the DIN-rail-mounted DTAO board. Although the PAOC can be mounted on TBAOH1A or TBAOH1B terminal boards, it will not achieve full analog signal accuracy due to circuit differences in these earlier revisions. Therefore, compatibility is limited to the H1C version of the TBAO board. If mistakenly powered on an older board, the PAOC will report a compatibility issue, but no physical damage will occur. Control mode refers to the number of I/O packs used in a signal path:

• Simplex uses one I/O pack with one or two network connections.
• Dual uses two I/O packs with one or two network connections.
• TMR uses three I/O packs with one network connection on each.

INSTALLATION:

• Connect one PAOC I/O pack for simplex configurations or three PAOC I/O packs for TMR directly to the terminal board connectors.

• Secure the packs using the threaded studs near the Ethernet ports. These studs slide into a mounting bracket specific to the terminal board type. Adjust the bracket's position to avoid applying right-angle force on the DC37 connector linking the pack and terminal board.

• Insert one or two Ethernet cables based on the system setup. The pack functions with either port, but dual connections should typically link ENET1 to the network associated with the R controller.

• Power the pack by connecting the power cable to the side connector. Removing power from the cable before the connection is unnecessary, as the pack�s soft-start capability manages inrush current when power is applied.

OPERATION:

The processor board interfaces with an acquisition board tailored to the I/O pack's function. When input power is applied, the soft-start circuit gradually increases the voltage to the processor board. Local power supplies activate sequentially, and the processor exits its reset state. It then performs self-tests and loads application code specific to the I/O pack type from flash memory. The code verifies compatibility by reading board ID information to confirm alignment between the application code, acquisition board, and terminal board.

Once verified, the processor initiates Ethernet communication by requesting a network address using the standard DHCP protocol and unique terminal board identification. After Ethernet setup, the processor configures the on-board logic, executes the application, and activates the acquisition board for operation. The processor application code enables the pack to function with one or two Ethernet inputs. When using two inputs, both network paths remain continuously active, ensuring uninterrupted operation even if one network fails.

Any failure is reported via the functioning network connection, offering greater fault tolerance compared to traditional hot-backup systems, where the secondary port activates only after a primary port failure. The Ethernet ports support auto-negotiation, adjusting to 10 MB/s or 100 MB/s speeds and switching between half-duplex and full-duplex modes as needed.

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FREQUENTLY ASKED QUESTIONS:

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

The PAOC serves as an electrical interface between one or two Ethernet networks and an analog output terminal board. It provides up to eight simplex 0-20 mA current loop outputs with current feedback via an analog-to-digital converter.

Which terminal boards are compatible with the PAOCH1A?

The PAOCH1A is compatible with the TBAOH1C terminal board and the STAO board, but is not compatible with the DIN-rail-mounted DTAO board. It can also be physically mounted on TBAOH1A or TBAOH1B boards, but it will not provide full analog signal accuracy.

How does the PAOC handle dual Ethernet connections?

When dual Ethernet connections are used, both network paths remain active simultaneously. This ensures continuous operation even if one network fails, with the failure reported via the working network.