IS220PDIOH1B Discrete Input/Output (I/O) Modules/Packs

The IS220PDIOH1B unit is a Discrete I/O Pack part of the General Electric Speedtronic Mark VI/VIe/VIeS gas turbine control modules with accessory combinations approved for use in hazardous locations. When the IS220PDIOH1B model is being operated in the chosen system, it is used with several terminal boards; some of the terminal boards used are labeled as follows:

• ISx0yTDBSH2A
• ISx0yTDBSH8A
• ISx0yTDBTH2A
• ISx0yTDBTH8A

These terminal boards extend the PDIO packs functionality, as the previous PDIO pack can only work with two accessory terminal boards. The terminal boards are labeled as Intrinsically Safe Apparatus Relay Contact terminal boards.

This unit contains two Ethernet ports, a local processor, and a data acquisition board for use within the GE Mark VI Speedtronic Series. The electronics technology for the Mark VIe I/O packs introduced in 2004 is obsolete. The front panel of the IS220PDIOH1B includes LED indicators for both ethernet ports for the unit’s power and an “attn” LED. Additional LEDs are related to relay connections.

The IS220PDIOH1B has a minimum voltage rating of 27.4 VDC, while the nominal rating is 28.0 VDC. The unit and its associated terminal boards have specific field wiring connection instructions that must be followed, including wire size and screw torque.

There are twenty-four field terminals when using the TDBS or TDBT boards on the IS220PDIOH1B. All of the positive terminals are labeled as contact-wetting inputs. Each of the terminals on the model differs between negative and positive terminals. For more information on the terminals, refer to the last page of the data sheet above.