Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual PLC Registers and Relays

DVP-ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming

1.4PLC Registers and Relays

Introduction to the basic internal devices in a PLC

	Bit memory represents the physical input points and receives external input
X	signals.
(Input Relay)	„ Device indication: Indicated as X and numbered in octal, e.g. X0~X7,
	X10~X17…X377
	Bit memory represents the physical output points and saves the status to be
Y	refreshed to physical output devices.
(Output Relay)	„ Device indication: Indicated as Y and numbered in octal, e.g. Y0~Y7,
	Y10~Y17. ..Y377
M	Bit memory indicates PLC status.
	„ Device indication: Indicated as M and numbered in decimal, e.g. M0, M1,
(Internal Relay)
	M2…M4095
	Bit memory indicates PLC status in Step Function Control (SFC) mode. If no
S	STL instruction is applied in program, step point S can be used as an internal
	relay M as well as an annunciator.
(Step Relay)
	„ Device indication: Indicated as S and numbered in decimal, e.g. S0, S1,
	S2…S1023
	Bit, word or double word memory used for timing and has coil, contact and
T	register in it. When its coil is ON and the set time is reached, the associated
(Relay)	contact will be energized. Every timer has its resolution (unit:
(Word)	1ms/10ms/100ms).
(Dword)	„ Device indication: Indicated as T and numbered in decimal, e.g. T0, T1,
	T2…T255
	Bit, word or double word memory used for counting and has coil, contact and
C	register in it. The counter count once (1 pulse) when the coil goes from OFF to
(Counter)	ON. When the predefined counter value is reached, the associated contact will
(Relay)	be energized. There are 16-bit and 32-bit high-speed counters available for
(Word)	users.
(Dword)	„ Device indication: Indicated as C and numbered in decimal, e.g. C0, C1,
	C2…C255
	Word memory stores values and parameters for data operations. Every
D	register is able to store a word (16-bit binary value). A double word will occupy
(Data register)	2 consecutive data registers.
(Word)	„ Device indication: Indicated as D and numbered in decimal, e.g. D0, D1,
	D2…D4999
E, F	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
(Index register)
	be used as general purpose register.
(Word)
	„ Device indication: indicated as E0 ~ E7 and F0 ~ F7.

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