IS220PSCAH1A, REV K - Serial Communication I/O Module

SPECIFICATIONS:

Part Number: IS220PSCAH1A, REV K
Manufacturer: General Electric
Series: Mark VIe
Product Type: Serial Communication I/O Module
Number of Channels: 24
Number of inputs: 12
Number of trip solenoids: 3
Number of outputs: 125 V dc
Technology: Surface Mount
Suppression: MOV across the solenoid
Trip interlock isolation: Optical isolation to 1500 V
Dimensions: 17.8 cm wide x 33.02 cm
Operating Temperature: 30 to 65°C
Repair: 3-7 Days
Availability: In Stock
Country of Origin: United States
Manual: GEI-100868A

FUNCTIONAL DESCRIPTION:

IS220PSCAH1A, REV K is a Serial Communication I/O Module manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The Serial Communication I/O pack provides the electrical interface between one or two I/O Ethernet networks and a serial communications terminal board. The I/O pack contains a BPPC processor board common to all Mark VIe distributed I/O packs and a serial communications board. The communications board contains six serial transceiver channels, each of which can be individually configured to comply with RS-232, RS-422, or RS-485 half-duplex standards. Input to the I/O pack is through dual RJ-45 Ethernet connectors and a 3-pin power input. Output is through a DC-62 pin connector that connects directly with the associated terminal board connector. One of the Ethernet ports can be used to support Ethernet Modbus communication on Simplex networks. Visual diagnostics are provided through indicator LEDs. The I/O pack contains a functionally compatible BPPC that is supported in ControlST V04.07 and later.

PSCA INSTALLATION:

• Directly plug one PSCA I/O pack into the SSCA terminal board connector.

• Mechanically secure the I/O 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 such that there is no right angle force applied to the DC-62 pin connector between the I/O pack and the terminal board. The adjustment should only be required once in the service life of the product.

• Plug in one or two Ethernet cables, depending on the system configuration. The I/O 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 PSCA is not sensitive to Ethernet connections and will negotiate proper operation over either port.

• Apply power to the I/O pack by plugging in the connector on the side of the pack. It is not necessary to remove power from the cable before plugging it in because the I/O pack has inherent soft-start capability that controls current inrush on power application.

• From the ToolboxST application, add the PSCA module, and add and configure the required devices. From the Component Editor, press F1 for help.

DATA FLOW FROM PSCA TO CONTROLLER:

Dataflow from the PSCA to the Mark VIe controller is of two types: fixed I/O and Modbus I/O. Fixed I/O is associated with the smart pressure transducers and the Kollmorgen® electric drive data. This data is completely processed every frame, the same as conventional I/O. These signals are mapped into signal space, have individual health bits, and have offset/gain scaling. Several of these signals are configured to support system limit checking. Modbus: Modbus I/O is the I/O associated with the Modbus ports. Because of the quantity of these signals, they are not completely processed every frame; instead, they are packaged and transferred to the Mark VIe controller, over the IONet through a special service. This can accommodate up to 2400 bytes at 4 Hz, or 9600 bytes at 1 Hz, or combinations thereof. This I/O is known as second-class I/O, where coherency is at the signal level only, not at the device or board level. Health bits are assigned to individual points in the same fashion as the other protocols, and system limit checking is not performed. Three consecutive time-outs are required before a signal is declared unhealthy. Diagnostic messages are used to announce all communication problems. The input value is cleared for a given signal after four consecutive time-outs occur on that signal.

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FREQUENTLY ASKED QUESTIONS:

What is a Serial Communication I/O Module?

A Serial Communication I/O Module enables communication between industrial control systems and serial devices using protocols like RS-232, RS-422, and RS-485. It acts as a bridge between field devices and the control network.

How does Ethernet integration benefit a Serial I/O Module?

Ethernet ports allow serial I/O modules to connect with modern control networks, enabling data exchange with controllers over IP-based protocols like Modbus TCP, increasing system flexibility and scalability.

How is the data transmitted to the controller?

Data from the module is transmitted to the controller in two forms: fixed I/O and Modbus I/O. Fixed I/O, which includes inputs from smart sensors and drive systems, is processed every frame and mapped into the signal space with full diagnostics. Modbus I/O is transmitted in larger data packets at defined intervals. These packets can contain up to 2400 bytes at 4 Hz or 9600 bytes at 1 Hz, depending on system needs.