Omron CPM1 Programming Manual

113
Calculating with Signed Binary Data Section 1-10
1-10 Calculating with Signed Binary Data
The CQM1/CPM1/CPM1A/SRM1 allow calculations on signed binary data.
The following instructions manipulate signed binary data. Signed data is han-
dled using 2’s complements.
CQM1 Instructions The following signed-binary instructions are available in CQM1 PCs:
Single-word Instructions
• 2’S COMPLEMENT – NEG(––)
• BINARY ADD – ADB(50)
• BINARY SUBTRACT – SBB(51)
• SIGNED BINARY MULTIPLY – MBS(––)
• SIGNED BINARY DIVIDE – DBS(––)
Double-word (Long) Instructions
• DOUBLE 2’S COMPLEMENT – NEGL(––)
• DOUBLE BINARY ADD – ADBL(––)
• DOUBLE BINARY SUBTRACT – SBBL(––)
• DOUBLE SIGNED BINARY MULTIPLY – MBSL(––)
• DOUBLE SIGNED BINARY DIVIDE – DBSL(––)
CPM1/CPM1A/SRM1
Instructions
The following signed-binary instructions are available in CPM1/CPM1A/SRM1
PCs:
• BINARY ADD – ADB(50)
• BINARY SUBTRACT – SBB(51)
Signed Data Calculations
1-10-1 Definition of Signed Binary Data
The CQM1 provides instructions that operate on either one or two words of
data; the CPM1/CPM1A/SRM1 provide just two instructions that operate on
one word of data. Signed binary data is manipulated using 2’s complements
and the MSB of the one- or two-word data is used as the sign bit. The range of
data that can be expressed using one or two words is thus as follows:
• One-word data:
–32,768 to 32,767 (8000 to 7FFF hexadecimal)
•
Two-word data:
–2,147,483,648 to 2,147,483,647 (8000 0000 to 7FFF FFFF hexadeci-
mal)
Addition
7 + 3 = 10
(–7) + 3 = –4
7 + (–3) = 4
(–7) + (–3) = –10
Multiplication
7 × 3 = 21
(–7) × 3 = –21
7 × (–3) = –21
(–7) × (–3) = 21
Subtraction
7 – 3 = 4
(–7) – 3 = –10
7 – (–3) = 10
(–7) – (–3) = –4
Division
7 ÷ 3 = 2 with a remainder of 1
(–7) ÷ 3 = –2 with a remainder of –1
7 ÷ (–3) = –2 with a remainder of 1
(–7) ÷ (–3) = 2 with a remainder of –1

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)