Overview

Intended User

Section 1

The NTDI02 Digital I/O Termination Unit is a Harmony rack

I/O device that is part of the Symphony Enterprise Manage

ment and Control System. It provides a signal path for up to

16 input signals to the following I/O modules. The inputs are

used by the controller to monitor and control a process.

• Analog output module (IMASO11).

• Digital input module (IMDSI13. IMDSI14. and IMDSI22).

• Pulse input module (IMDSM04).

• Digital output module (IMDSO14 and IMDSO15).

• Frequency counter module (IMFCS01).

Figure 1-1 shows the Harmony rack I/O architecture. A Har

mony area controller and the Harmony rack controllers can

use the rack I/O module and termination units for I/O interface.

Personnel installing, operating, or maintaining the NTDI02 ter

mination unit should read this instruction before performing

any installation, operation, or maintenance procedures. Instal

lation requires an engineer or technician with experience

handling electronic circuitry. Those working with the NTDI02

termination unit should have experience working with and

know the precautions to take around AC/DC power. A knowl

edge of the Symphony system and electronic principles is also required.