Omron CPM1 Programming Manual

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Glossary
of the data is sent to the destination, i.e., the content of the source of the transfer
is not changed.
transmission distance The distance that a signal can be transmitted.
trigger A signal used to activate some process, e.g., the execution of a trace operation.
trigger address An address in the program that defines the beginning point for tracing. The ac-
tual beginning point can be altered from the trigger by defining either a positive
or negative delay.
UM area The memory area used to hold the active program, i.e., the program that is being
currently executed.
Unit In OMRON PC terminology, the word Unit is capitalized to indicate any product
sold for a PC System. Most of the names of these products end with the word
Unit.
unit number A number assigned to some Units to facilitate identification when assigning
words or other operating parameters.
unmasked bit A bit whose status is effective. See masked bit.
unsigned binary A binary value that is stored in memory without any indication of whether it is
positive or negative.
uploading The process of transferring a program or data from a lower-level or slave com-
puter to a higher-level or host computer. If a Programming Devices is involved,
the Programming Device is considered the host computer.
watchdog timer A timer within the system that ensures that the scan time stays within specified
limits. When limits are reached, either warnings are given or PC operation is
stopped depending on the particular limit that is reached.
WDT See watchdog timer.
word A unit of data storage in memory that consists of 16 bits. All data areas consists
of words. Some data areas can be accessed only by words; others, by either
words or bits.
word address The location in memory where a word of data is stored. A word address must
specify (sometimes by default) the data area and the number of the word that is
being addressed.
work area A part of memory containing work words/bits.
work bit A bit in a work word.
work word A word that can be used for data calculation or other manipulation in program-
ming, i.e., a `work space’ in memory. A large portion of the IR area is always re-
served for work words. Parts of other areas not required for special purposes
may also be used as work words.
write protect switch A switch used to write-protect the contents of a storage device, e.g., a floppy
disk. If the hole on the upper left of a floppy disk is open, the information on this
floppy disk cannot be altered.
write-protect A state in which the contents of a storage device can be read but cannot be al-
tered.

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)