259
8-9. Terminology
A unit of memory for various types of data. A register is usually 16 bits wide.
Read Only Memory. See EEPROM and EPROM.
An EIA communication standard for data transmission media that is less than
15 m. Most common serial communication standard.
An EIA communication standard for data transmission media.
Term for a ladder program. A rung refers to the programmed instructions that
drive one output.
Time required to read all inputs, execute the program, and update local and
remote information.
A function within the programmable controller which monitors operation and
indicates any fault that is detected.
A communication style in which data is transmitted bit by bit serially.
The last bit when a character is transmitted.
Errors resulting from the device or the environment.
The registers used only for system settings of the programmable controller.
A programming technique to operate a bit only for one scan at the moment
its input condition turns OFF from the ON state.
A number system used to express positive and negative numbers in binary. In
this system, the number becomes negative if the most significant bit of the
data is “1”. In FP series programmable controllers, numbers are expressed
using the two’s complement.
The act of going below the minimum limit in a register’s capacity.
A timer that monitors processing time of the programmable controller. If the
program does not time out, the processor is assumed to be faulty.
A unit of bits which is usually executed at the same time. A word is
composed of 16 bits.
register:
ROM:
RS232C:
RS422:
rung:
scan:
self-diagnostic function:
serial communication:
stop bit:
system errors:
system register:
trailing edge differential:
two's complement:
underflow:
watchdog timer:
word:
Summary of Contents for FP1
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