Cutler-Hammer D320 PLC, User Manual

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Chapter 1: Introduction
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The D320 PLC is built to simplify operation, maintenance, and repair with its modular design
and removable terminal.
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I/O flexibility is achieved through the wide variety of available digital and analog modules,
covering a broad range of voltage and current ratings.
The D320 PLC has many additional features that combine to make it the ideal choice for many control
applications.
Self Diagnostics
While in the Run mode, the D320 PLC provides continuous self-diagnostics and error-checking on the
processor, control program, and I/O system. Built-in diagnostics also perform error-checking during
program download and system initialization. Error status information is stored internally, providing for
quick and easy troubleshooting of system and programming errors.
PID Loop Control
A built-in 8-loop PID processor easily handles demanding analog process control requirements, such
as temperature and/or position control.
Real-time Clock
A real-time clock (RTC) function enables time and date related programming tasks, including alarm
recording, process scheduling, and product serialization.
Large Program Memory
Sufficient program capacity is furnished for even the most demanding applications. Internal program
memory handles up to 24K separate control steps.
NOVRAM Battery-Backup
An easily-replaceable lithium battery provides up to 10 years of program and data backup..
I/O and Special Function Module Support
The D320 PLC I/O module line includes complete coverage of all major standard I/O requirements.
Digital input modules include 24 VDC in both 16 and 32 points, and 16 point 5-12 VDC, 115 VAC
and 230 VAC modules. Digital output modules include 24 VDC transistor and relay types in 16 and 32
points, and 16 point 115/230 VAC triac type. Analog support is available for voltage and current A/D
and D/A, as well as RTD and thermocouple inputs. Special function modules include high-speed
counter and serial data communications modules. Finally, wire-link network modules can provide
peer-to-peer networking for loops of up to 32 PLC's each.