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When COM ports are configured as Modbus slaves, the internal PLC tags are mapped to the modbus addresses as
given in the following table:
PLC Tag description Reg. Addressing
Bit
Addressing Modbus address
I/O register XW(400)
X
(6400) 440001 - 440400
YW(400) Y (6400) 441001 - 441400
Auxiliary registers BW00-BW255 B0000 to B4095 442001 - 442256
System Registers SW00-SW256 Not Mapped 420001 - 420256
Timer Registers T00-T255 Not Mapped 400001 - 400256
Counter Register C00-C255 Not Mapped 410001 - 410256
Data Registers D0000-D4095 Not Mapped 450001 - 454096
Retentive Registers Not Mapped 430001 - 431400
Index Register (I,J,K) I Not Mapped 443001
J Not Mapped 443002
K Not Mapped 443003
Configuration MW registers MW(1600) M(25600) 460001-461600
COILS:
TR0- TR15
Input Coil (R)
X
(6400) 000001 - 006400
Output Coil (R/W)
Y (6400) 010001 - 016400
System Coil (R/W)
S 0000 to S 0099 020001 - 020100
Internal Coil (R/W)
B 0000 to B 1023 030001 - 034096
Timer Devices (256 bits = 16 words)
T. 000 to T. 255 021001 - 021256
Counter Devices (256 bits = 16 words)
C. 000 to C. 255 022001 - 022256
Configuration MW coils
M(25600) 035001 - 060600