IS420ESWBH1A - 16 ports Ethernet IONet Switch 10/100Base-TX

Functional Description

Overview of IS420ESWBH1A

IS420ESWBH1A is a 16-port Ethernet IONet Switch 10/100Base-TX manufactured and designed by General Electric as part of the Mark VIe series used in GE Distributed Control Systems. GE's Industrial Ethernet 10/100 switches (ESWA and ESWB) provide the performance and features needed in real-time industrial control systems. Use 8-port ESWA or 16-port ESWB Ethernet switches in all control system I/O networks to maintain the reliability needed for I/O module reception of controller outputs.

DISTRIBUTED I/O MODULES

The I/O modules contain three basic parts: terminal board, terminal block, and I/O pack. The terminal board mounts to the cabinet and comes in two basic types: S and T. The I/O pack mounts to the terminal board J-port connector. Both terminal board types provide the following features:

• Terminal blocks for I/O wiring
• Mounting hardware
• Input isolation and protection
• I/O pack connectors
• Unique electronic ID

I/O PACKS

I/O packs have a common processor board and a data acquisition board that is unique to the type of connected device. I/O packs on each terminal board digitize the I/O variables, perform algorithms and communicate with the controller. The I/O pack provides fault detection through a combination of special circuitry in the data acquisition board and software running in the Central Processing Unit (CPU) board. The fault status is transmitted to and used by the controllers. The I/O pack transmits inputs and receives outputs on both network interfaces if connected. Each I/O pack also sends an identification message (ID packet) to the main controller when requested. The packet contains the hardware catalog number of the I/O board, the hardware revision, the board barcode serial number, the firmware catalog number, and the firmware version. The I/O packs have a temperature sensor that is accurate to within ±2°C (±3.6 °F). Every I/O pack temperature is available in the database and can be used to generate an alarm.

TERMINAL BOARDS

Signal flow begins with a sensor connected to a terminal block on a board. Wide and narrow terminal boards are arranged in vertical columns of high and low-level wiring. An example of a wide board is a board that contains magnetic relays with fused circuits for solenoid drivers. A shield strip is provided to the left of each terminal block. It can be connected to a metal base for immediate grounding or floated to allow individual ground wires from each board to be wired to a centralized, cabinet ground strip.