Omron CPM1 Programming Manual

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SECTION 4
Ladder-diagram Programming
This section explains the basic steps and concepts involved in writing a basic ladder diagram program. It introduces the
instructions that are used to build the basic structure of the ladder diagram and control its execution. The entire set of
instructions used in programming is described in SECTION 5 Instruction Set.
4-1 Basic Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
4-2 Instruction Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
4-3 Basic Ladder Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
4-3-1 Basic Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
4-3-2 Mnemonic Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
4-3-3 Ladder Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
4-3-4 OUTPUT and OUTPUT NOT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
4-3-5 The END Instruction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
4-3-6 Logic Block Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
4-3-7 Coding Multiple Right-hand Instructions. . . . . . . . . . . . . . . . . . . . . 172
4-3-8 Branching Instruction Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
4-3-9 Jumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
4-4 Controlling Bit Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
4-4-1 SET and RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
4-4-2 DIFFERENTIATE UP and DIFFERENTIATE DOWN. . . . . . . . . . 178
4-4-3 KEEP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
4-4-4 Self-maintaining Bits (Seal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
4-5 Work Bits (Internal Relays) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
4-6 Programming Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
4-7 Program Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Omron CPM1 Specifications

General

Model	CPM1
Manufacturer	Omron
Instruction Set	Basic and advanced instructions
Power Supply	100 to 240 VAC or 24 VDC
Communication	RS-232C
I/O Points	10, 20, 30, or 40 points depending on the model
Timers	Yes, multiple timers available
Counters	Yes, multiple counters available
Input Voltage	24V DC
Output Type	Relay or transistor
Number of I/O Points	10, 20, 30, 40
Communication Ports	RS-232C (optional)
Operating Temperature	0°C to 55°C
Storage Temperature	-20°C
Humidity	10% to 90% (non-condensing)
Dimensions	Varies depending on the model
Weight	Varies depending on the model
Program Memory	2048 steps (2K steps)