IS420YAICS1B Analog I/O Pack | 10-Channel Safety GE

The General Electric IS420YAICS1B is a high-precision Analog Input/Output (I/O) Pack for the Mark VIeS Safety control system. Engineered for critical applications, this module provides reliable signal conditioning for up to ten analog channels, serving as a secure interface between Ethernet control networks and field sensors in demanding industrial environments.

Core Technical Specifications

• Brand & Model: General Electric IS420YAICS1B
• Series: Speedtronic Mark VIeS Safety Control System
• Module Type: Analog I/O Pack (YAIC)
• Analog Inputs: 10 channels total.
• Input Configuration: Channels 1-8: ±5V, ±10V, or 4-20 mA; Channels 9-10: ±1 mA or 4-20 mA.
• Resolution: High-accuracy 16-bit Analog-to-Digital Converter (ADC).
• Power Consumption: 5.3 Watts typical.

Signal Integrity & Performance

• Accuracy: 0.1% of full scale across the operating temperature range.
• Noise Suppression: Hardware filter with 500 rad/s cutoff; Software-selectable 2-pole low-pass filter (0.75, 1.5, 3, 6, 12 Hz).
• Common Mode Rejection (CMR): Excellent 60 dB at 60 Hz for AC signals, with a range of up to ±5V.
• Processor: Equipped with the BPPC processor board.

Physical Design & Integration

• Dimensions (HxWxD): 3.25" x 1.65" x 4.78" (82.6 mm x 41.9 mm x 121.4 mm).
• Connectors: DC-37 pin (to terminal board), two RJ-45 Ethernet (ENET1/ENET2), and a 3-pin 28VDC power input.
• Mounting: Plugs directly into compatible terminal boards (TBAISIC, STAIS#A); secured via threaded studs and bracket.
• Power Feature: Built-in soft-start capability controls inrush current.

System Compatibility & Requirements

• Software: Requires ControlST Software Suite V06.01 or later.
• Firmware: Compatible with firmware V05.01 or later.
• Redundancy: Supports Simplex (1 pack) or TMR (Triple Modular Redundancy with 3 identical packs). Cannot be used in Dual redundancy.
• Mixing Rule: Cannot be mixed with older YAICS1A versions on the same T-type terminal board. A TMR set must use three identical packs.

Diagnostics & Environmental

• Self-Diagnostics: Performs power-up self-tests on flash/RAM memory, processor hardware, and Ethernet ports. Continuously monitors internal power supplies.
• Visual Indicators: Front-panel LED lights provide operational status.
• Operating Temperature: -40°F to 158°F (-40°C to 70°C).
• Documentation: Refer to GE Manual GEH-6855 for complete details.

Frequently Asked Questions (FAQ)

What is the main purpose of this I/O pack?

It acts as a high-integrity interface, converting real-world analog sensor signals (like voltage or 4-20 mA current) into digital data for the Mark VIeS safety controller, and vice-versa. It ensures signal accuracy and isolation within safety loops.

Can I use different sensor types on the same module?

Yes, its flexibility is a key feature. For example, you could connect pressure transmitters (4-20 mA) on channels 1-4, thermocouple transmitters (±10V) on channels 5-8, and special low-current sensors (1 mA) on channels 9-10, all on one IS420YAICS1B pack.

Why is Common Mode Rejection (CMR) important?

High CMR (60 dB) means the module effectively rejects electrical noise that is common to both signal wires. This is critical in industrial environments with heavy machinery to prevent noise from corrupting your sensor readings and causing control errors.

What is the difference between YAICS1A and YAICS1B?

The YAICS1A uses an older BPPB processor with firmware support only up to V04.06. The YAICS1B uses the newer BPPC processor, supports firmware V05.01+, and requires ControlST V06.01+. They are not interchangeable in the same terminal board.

How is the module configured and monitored?

Configuration (setting input types, filter frequencies) is done using GE's ToolboxST software. Status and diagnostics are monitored through the same software and via the module's LED indicators.