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8-13. Terminology
The decimal number system uses the number 10 as the base and the
allowable symbols are “0”, “1”, “2”, “3”, “4”, “5”, “6”, “7”, “8”, and “9”.
Each digit position has a weighted value of 1, 10, 100, 1000, and so on,
begining with the least significant (right-most) digit.
See full-duplex.
Electrically Erasable Programmable Read Only Memory. EEPROM can be
programmed and erased by electrical pulses.
Erasable Programmable Read Only Memory. EPROM can be reprogrammed
after being entirely erased with the use of an ultra-violet light source.
See First-In-First-Out.
The order that data is written in, and read from registers.
A relay used to detect and remember certain events in the programmable
controller. In FP series programmable controllers, some of the special
internal relays are used as flags.
A communication link in which data can be transmitted and received at the
same time.
A communication link in which transmission is limited to one direction at a
time.
The hexadecimal number system uses 16 as the base. The allowable symbols
are numbers 0 through 9 and letters A through F. The letters are substituted
for numbers 10 to 15, respectively, to represent all 16 numbers in one digit.
The binary number system can easily be represented in hexadecimal with 4
bit groups. In this manner, a very large binary number can be represented by
a hexadecimal number with significantly fewer digits.
The memory area whose contents will not be lost or modified if operating
power is lost or if the mode of the programmable controller is changed from
RUN to PROG.
The act of performing a more urgent task by putting off the presently
executing task. FP series programmable controllers have three types of
interrupts, as follows:
- input initiated interrupt
- high-speed counter initiated interrupt
- time initiated interrupt
A
0
1
1 Digit position
Hexadecimal
9
3
F
2
0 1
11
1
8
1
1 0 1
3 0
1
15
0 1
12
1 1
0
0
7 4
0 0
Bit position
Binary
• • • • • • • •
Most significant
digit
Least significant
digit
decimal number system:
duplex:
EEPROM:
EPROM:
FIFO:
First-In-First-Out:
flag:
full-duplex:
half-duplex:
hexadecimal:
hold:
interrupt: