IS220PAOCH1A, REV D - Analog Output Module

SPECIFICATIONS:

Part Number: IS220PAOCH1A, REV D
Manufacturer: General Electric
Series: Mark VIe
Product Type: Analog Output Module
Number of channels: Eight current output channels
Analog Outputs: 0-20 mA, up to 900 Ω
Accuracy: ±0.5% over -30 to 65oC (-22 to 149 oF) temperature
Size: 8.26 cm high x 4.19 cm wide x 12.1 cm deep (3.25 in x 1.65 in x 4.78 in)
Operating Temperature: -30 to 65°C
Availability: In Stock
Country of Origin: USA
Manual: GEH-6721D

FUNCTIONAL DESCRIPTION:

IS220PAOCH1A, REV D is an Analog Output Module manufactured and Designed by General Electric as part of the Mark VIe Series used in 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 features a processor board common to all Mark VIe distributed I/O packs, along with an acquisition board pair designed specifically for analog output functions. The pack supports up to eight simplex 0-20 mA current loop outputs and includes an analog-to-digital converter for current feedback from each output. It receives input via dual RJ45 Ethernet connectors and a three-pin power input, while output is facilitated through a DC-37 pin connector that directly connects to the associated terminal board. Visual diagnostics are provided by indicator LEDs, and local diagnostics can be accessed through an infrared port for serial communication.

PAOC COMPATIBILITY:

PAOCH1A is compatible with the analog output terminal board TBAOH1C, and the STAO board, but not the DIN-rail mounted DTAO board. 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.

While the PAOC will be mounted on a TBAOH1A or TBAOH1B terminal board, the pack will not realize the full accuracy of the analog signals due to circuit differences between the terminal board revisions. For this reason, the PAOC is only compatible with the H1C version of TBAO and will report compatibility problems with any of the earlier revisions. No physical damage will result if a PAOC is powered up on an older board in error.

PAOC I/O PACK INSTALLATION:

• Directly connect the PAOC I/O pack(s) to the terminal board (s) connector.

• Using the threaded studs next to the Ethernet ports, mechanically fasten the I/O pack(s). The studs slip into a mounting bracket made for the particular style of the terminal board.

• Positioning the bracket so that the DC-37 pin connector connecting the I/O pack and the terminal board is not subjected to right-angle forces is important. In the course of the product's service life, the adjustment should only be necessary once.

• Depending on the setup of the machine, connect either one or two Ethernet wires. Either port will work with the I/O pack. When using dual connections, it is customary to link ENET1 to the network connected to the R controller.

• Connect the connector on the side of the PAOC to provide power to the I/O pack. Because the I/O pack has an inherent soft-start feature that regulates current inrush on power application, it is not essential to turn off the power before plugging the cable in.

• If necessary, set up the I/O pack using the ToolboxST program. Press F1 to bring up the Component Editor's help menu.

OPERATION:

The processor board connects to an acquisition board specific to the I/O pack function. Upon application of input power, the soft-start circuit ramps up the voltage available on the processor board. The local power supplies are sequenced, and the processor reset is removed. The processor completes self-test routines and then loads application code specific to the I/O pack type from flash memory. The application code reads board ID information to ensure the correct matching of the application code, acquisition board, and terminal board. With a good match, the processor attempts to establish Ethernet communications, starting with the request of a network address. The address request uses the industry standard dynamic host configuration protocol (DHCP) and the unique identification read from the terminal board. After Ethernet initialization, the processor programs the onboard logic, run the application, and enables the acquisition board to begin operation.

• 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

ANALOG OUTPUT HARDWARE:

Eight simplex 0-20 mA analog outputs with 18 V compliance are included in the PAOC. An external transistor amplifier is controlled and driven by a 16-bit digital-to-analog converter (DAC), which also controls the output current. To alert the control if the internal temperature of the pack becomes too high, a temperature sensor is built inside the board. Additionally, each analog output circuit has a mechanical normally open relay that controls whether the output is enabled or disabled. When the disabled relay is turned off, the output flows via the relay and opens a circuit between the customer load attached to the terminal board and the analog output of the PAOC. The location of the mechanical relay is signaled by an LED using the second normally open contact of the relay.

CURRENT FEEDBACK HARDWARE:

For each of the eight simplex 0-20 mA analog outputs, the PAOC includes current feedback monitoring. The output current is sensed and tracked using a 16-bit analog-to-digital converter and a 50 resistor on the terminal board.

The PAOC I/O pack, which has eight linear, high-compliance analog outputs, has application restrictions based on its probable ambient environment. As measured from the outside of the pack, PAOCH1B packs are designed to operate within a temperature range of -40 to 70 oC (-40 to 158 oF). Due to its dense triple board layout and depending on the application, the PAOC's ambient environment maximum must be reduced. Here is a list of output configurations along with the necessary de-ratings for each one. As evidenced by the terminal board screws across the output range of 0–20 mA, the minimum series equivalent resistance of the customer load is the definition of the minimum output impedance.

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FREQUENTLY ASKED QUESTIONS:

What is the function of the PAOC module?

The PAOC module serves as a crucial interface between one or two I/O Ethernet networks and an analog output terminal board. It processes analog output signals and ensures accurate transmission to connected devices. Additionally, it supports real-time diagnostics, enhancing system reliability and performance monitoring.

What terminal boards are compatible with the PAOC module?

The PAOC module is compatible with the TBAOH1C and STAO terminal boards, which allows it to function efficiently within a control system. However, it is not compatible with the DIN-rail-mounted DTAO board. Using the correct terminal board is essential for proper operation and signal accuracy.

How does the PAOC module ensure accuracy in signal processing?

The PAOC module uses a 16-bit digital-to-analog converter (DAC) to generate precise output signals. It also incorporates a 16-bit analog-to-digital converter (ADC) to provide real-time current feedback, ensuring that the system operates within the specified parameters and maintains high accuracy in analog signal transmission.