Data Registers

CICON Data Registers

Data Registers
Data Register	Use Case	Data Type	Note
X	Input	BOOL	Physical input, Read-only
Y	Output	BOOL	Physical output
M	Internal Relay	WORD	Used for internal control logic
L	Link Relay	WORD	For communication synchronization Inter-PLC linking
K	Keep Relay	WORD	Non-volatile Retains values during power-off
F	Flag Relay	WORD	Used for system-level operations
T	Timer	WORD	Holds current time (TC) and set time (TS)
C	Counter	WORD	Holds current count (CC) and set value (CS)
S	Step	STEP	Used for sequential process control
D	Data Register	WORD	General-purpose memory for data storage
Z	Index Register	WORD	Used for indirect addressing
Q	Pulse	WORD	Holds pulse control data
R	Register	WORD	Reserved for special indexing
@D	Indirect Data	WORD	Sub-register for data manipulation

Additional Communication

Modbus

Modbus Mapping
Modbus Register	Address Range	Data Type	CICON Data Register	Note
Coils (0x)	00001 - 09999	BOOL	Y	Digital outputs Read/Write
Discrete Inputs (1x)	10001 - 19999	BOOL	X	Digital inputs Read-only
Input Registers (3x)	30001 - 39999	WORD	M	Analog inputs Read-only
Holding Registers (4x)	40001 - 49999	WORD	D	General-purpose Read/Write

Allen-Bradley Equivalent

This is a mapping equivalent of CICON ↔ Allen-Bradley data registers.

CICON ↔ Allen-Bradley Mapping
CICON Register	Allen-Bradley Equivalent	Data Type	Notes
X	I	BOOL	Physical inputs
Y	O	BOOL	Physical outputs
M	B3	BOOL	Internal memory bits for logic
L	B3	BOOL or WORD	Inter-PLC communication
K	B3 (latched bits)	BOOL or WORD	Retentive memory
F	S (Status bits)	BOOL	System flags or status information
T	T4	Timer	Timers with .ACC and .PRE fields
C	C5	Counter	Counters with .ACC and .PRE fields
S	N or B3	WORD or BOOL	Used for sequential control
D	N	WORD	General-purpose data storage
Z	#N (Indirect Addressing)	WORD	Index register Used for indirect addressing
Q	O or N	BOOL or WORD	Pulse control
R	#N	WORD	Used for advanced indexing
@D	#N	WORD	Indirect addressing in integer or float files