1
SECTION 1
Introduction
The C200H-NC111 Position Control Unit is a Special I/O Unit that receives positioning commands either externally or
from a Programmable Controller (PC) and uses that data to output control voltages to a stepping motor driver or a ser-
vomotor driver.
This section describes the basic features and components of the Position Control Unit, as well as the basic configuration
and operating principles of positioning control systems. Be sure to read and study these sections carefully; an understand-
ing of the control system is essential for successful operation.
1–1
Features
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–2
Components
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–3
System Configuration
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–4
Control System Principles
5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–4–1
Open-loop System
7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–4–2
Semi-closed-loop System
8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
