Product Core Brief

• Model: IS220PAICH2A
• Part Number: 336A4940CSP11
• Brand: GE (General Electric)
• Series: Speedtronic Mark VIe — Analog I/O Pack (PAIC)
• Core Function: Analog signal acquisition and output module for processing turbine control signals (temperature, pressure, position) and driving analog actuators in GE Mark VIe systems.
• Product Type: Analog I/O Module
• Key Specs: 10 analog inputs (8 configurable 4-20mA/5-10V + 2 configurable 1-20mA/4-20mA) | 2 analog outputs (0-20mA, Ch1 supports 0-200mA) | DC-37 terminal board interface | Dual RJ-45 IONet Ethernet | ToolboxST configurable
• Condition: New Original / New Surplus

Product Introduction

The GE IS220PAICH2A (Part Number 336A4940CSP11) is an analog I/O module from GE’s Mark VIe Speedtronic turbine control series. It serves as the critical interface between the Mark VIe controller’s IONet Ethernet network and field analog devices, providing both signal acquisition and analog output capabilities in a single pack.

This module features 10 analog input channels: the first 8 channels are configurable for 5V, 10V, or 4-20mA current loop inputs, while the last 2 channels support 1mA or 4-20mA current inputs. Current loop load termination resistors are located on the terminal board, and the PAIC module senses the voltage across these resistors. It also provides 2 analog output channels with a standard 0-20mA range, with Channel 1 featuring additional hardware to support an extended 0-200mA output range for high-current actuator applications.

The module includes a BPPx processor board and a dedicated analog acquisition board. It connects to the terminal board via a single DC-37 pin connector and communicates with the controller over dual RJ-45 Ethernet ports (IONet). The module is powered via a 3-pin connector and features LED indicators for visual diagnostics. Configuration and parameterization are performed using GE’s ToolboxST software.

Key Technical Specifications

Quality Control Process

Every IS220PAICH2A module goes through a four-stage bench check before shipping. First, a visual inspection under magnification checks for cold solder joints, cracked traces, and DC-37 connector pin damage — common failure points on analog modules exposed to turbine-deck vibration. Second, we power up the module on a verified Mark VIe test rack and confirm the 3-pin power input circuit reads within spec using a Fluke 87V. Third, we inject calibrated voltage and current signals into all 10 analog input channels and verify accurate acquisition on the IONet bus, then command both analog output channels (including the 0-200mA range on Ch1) and verify output accuracy against a precision reference meter. Fourth, we confirm both RJ-45 Ethernet ports establish proper IONet communication and that all diagnostic LEDs indicate correct status. Finally, the module is sealed in anti-static foam with desiccant — no exceptions.

Replacement Pitfall Guide

❗ Input channel configuration mismatch. Channels 1-8 support 5V, 10V, or 4-20mA, while channels 9-10 support 1mA or 4-20mA. If the ToolboxST configuration doesn’t match the actual field signal type, the controller will read incorrect values. Always export the ToolboxST configuration from the original module before swapping.

❗ Current loop termination resistor location. The load termination resistors for current loop inputs are on the terminal board, not the PAIC module. The module senses voltage across these resistors. If the terminal board’s resistors are damaged or incorrectly valued, input readings will be wrong regardless of module health. Verify terminal board resistor values during replacement.

❗ 0-200mA output hardware enable. Channel 1’s extended 0-200mA output requires specific hardware configuration. If your application requires this range but the replacement module lacks the hardware option or the ToolboxST configuration doesn’t enable it, the output will be limited to 0-20mA. Verify the hardware option and software configuration match.

❗ DC-37 connector pin damage. The DC-37 connector is the sole mechanical and electrical interface to the terminal board. Bent pins, corrosion, or incomplete seating will cause intermittent or complete signal loss. Inspect the connector carefully before installation and ensure the mechanical locking bolts are properly tightened.

❗ IONet port assignment. The module has dual RJ-45 ports (ENET1 and ENET2). In redundant configurations, ENET1 typically connects to the R controller network. Swapping the cables can break redundancy or cause communication failures. Verify cable assignments against the system documentation.

❗ ToolboxST auto-reconfiguration. The module supports automatic reconfiguration on replacement, but this feature must be enabled in ToolboxST. If disabled, the new module will not inherit the correct analog scaling, filtering, and alarm parameters. Always verify the auto-reconfig setting before swapping.

Keep these in mind and you’ll cut 90% of rework time.

Compatibility Matrix & Benchmarks

Benchmarks:

• 10 analog inputs (8x 5V/10V/4-20mA + 2x 1mA/4-20mA)
• 2 analog outputs (0-20mA, Ch1 supports 0-200mA)
• DC-37 terminal board interface with dual RJ-45 IONet Ethernet
• ToolboxST configurable with LED diagnostics