Allen-Bradley PLC-5 User Manual

Publication 1785-UM012D-EN-P - July 2005
4-10 Addressing I/O and Controller Memory
Understanding PLC-5
Controller Memory
Controller memory is divided into two basic areas:
Storage Areas Description
Data All of the data the controller examines or changes is stored in files in data
storage areas of memory. These storage areas store:
• Data received from input modules
• Data to be sent to output modules; this data represents decisions made
by the logic
• Intermediate results made by the logic
• Preloaded data such as presets and recipes
• Control instructions
•System status
Program Files You create files for program logic, depending on the method you are using:
ladder logic, sequential function charts, and/or structured text. These files
contain the instructions to examine inputs and outputs and return results.

Allen-Bradley PLC-5 Specifications

General

Programming Software	RSLogix 5
Programming Languages	Ladder Logic
Power Supply	120/240V AC or 24V DC
Communication Ports	DH+, Remote I/O, Ethernet/IP, ControlNet
Operating Temperature	0 to 60°C (32 to 140°F)
Relative Humidity	5 to 95% non-condensing
Memory	Up to 64K words (user program and data)