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1-4
1.4 ELC Registers and Relays
Introduction to the basic internal devices in an ELC
X
(Input Relay)
Bit memory which represents the physical input points and receives external
input signals.
Represented as
X
and numbered in octal, e.g. X0~X7, X10~X17…
Y
(Output Relay)
Bit memory which represents the physical output points and saves the status
to be refreshed to physical output devices.
Represented as
Y
and numbered in octal, e.g. Y0~Y7, Y10~Y17...
M
(Internal Relay)
Bit memory indicates ELC status.
Internal bit memory: represented as
M
and numbered in decimal, e.g. M0,
M1, M2…
S
(Step Relay)
Bit memory indicates ELC status in Step Function Control (SFC) mode. If no
STL instruction is applied in program, step point S can be used as an internal
relay M as well as an annunciator.
Internal bit memory: represented as
S
and numbered in decimal, e.g. S0,
S1, S2…
T
(Timer)
(Relay)
(Word)
Bit, word or double word memory used for timing. When its coil is ON and the
set time is reached, the associated contact will be energized. Every timer has
its resolution (unit: 1ms/10ms/100ms).
Represented as
T
and numbered in decimal, e.g. T0, T1, T2…
C
(Counter)
(Relay)
(Word)
(Dword)
Bit, word or double word memory used for counting. The counter counts once
(1 pulse) when the coil goes from OFF to ON. When the predefined counter
value is reached, the associated contact will be energized. There are 16-bit
and 32-bit high-speed counters available for users.
Represented as
C
and numbered in decimal, e.g. C0, C1, C2…
D
(Data register)
(Word)
Word memory stores values and parameters for data operations. Every
register is able to store a word (16-bit binary value). A double word will occupy
2 consecutive data registers.
Represented as
D
and numbered in decimal, e.g. D0, D1, D2…
E, F
(Index register)
(Word)
Word memory used as a modifier to indicate a specified device (word and
double word) by defining an offset. Index registers not used as a modifier can
be used as general purpose registers.
Represented as E0 ~ E7 and F0 ~ F7.
Содержание ELC-PB
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