IDEC FT1A Series User Manual page 273

Address Map
Modbus Device Name
Coil
(000000 and above)
Input Relay
(100000 and above)
Input Register
(300000 and above)
Holding Register
(400000 and above)
*1: Addresses generally used for Modbus communication. Calculation method of Modbus addresses for SmartAXIS devices are described below.
*2: These 4-digit addresses are used in the communication frame. To calculate the address used in communication frame, extract lower 5 digits of
the Modbus address, subtract 1 from the value, and convert the result into hexadecimal.
*3: Access within the device range for the SmartAXIS type used.
Calculating Modbus Addresses for SmartAXIS Devices
SmartAXIS Device
M XXX X
I, Q, M
D XXXXX
R, T, C, D
Modbus Device Name
Coil
Input Relay
Input Register
Holding Register
Modbus Address Communication
*1
Map (Decimal) Frame Address
000001 - 000112 0000 - 006F
000701 - 000828 02BC - 033B
001001 - 002024 03E8 - 07E7
009001 - 009144 2328 - 23B7
100001 - 100126 0000 - 007D
101001 - 101200 03E8 - 04AF
101501 - 101700 05DC - 06A3
300001 - 300200 0000 - 00C7
300501 - 300700 01F4 - 02BB
400001 - 402000 0000 - 07CF
408001 - 408200 1F40 - 2007
409001 - 409200 2328 - 23EF
409501 - 409700 251C - 25E3
Calculating Modbus Address
(
(1)
(2): Octal
(1): Decimal
(
(3)
(3): Decimal
SmartAXIS Device
Q0 - Q141
R0 - R127
M0 - M1277
M8000 - M8177
I0 - I155
T0 - T199 (timer contact)
C0 - C199 (counter contact)
T0 - T199 (timer current value)
C0 - C199 (counter current value)
D0 - D1999
D8000 - D8199
T0 - T199 (timer preset value)
C0 - C199 (counter preset value)
S AXIS P
MART RO
SmartAXIS Device
*2
Q0 - Q141
R0 - R127
M0 - M1277
M8000 - M8177
I0 - I155
T0 - T199 (timer contact)
C0 - C199 (counter contact)
T0 - T199 (timer current value)
C0 - C199 (counter current value)
D0 - D1999
D8000 - D8199
T0 - T199 (timer preset value)
C0 - C199 (counter preset value)
×
– ) 8 + +
(4) (2) (5)
Minimum Offset
address
– ) +
(4) (5)
Minimum Offset
address
Minimum Address (4)
/L U ' M FT9Y-B1378
ITE SER S ANUAL
11: M C
ODBUS OMMUNICATION
*3
Calculation Example
Example: M325
(32 – 0) × 8 + 5 + 1001 = 1262
Modbus address: 1262
1262 – 1 = 1261 = 04ED
Communication frame address: 04ED
Example: D756
(756 – 0) + 400001 = 400757
Modbus address: 400757
Extract lower 5 digits → 757
757 – 1 = 756 = 02F4
Communication frame address: 02F4
0
0
0
8000
0
0
0
0
0
0
8000
0
0
Applicable
Function Code
1, 5, 15
2
4
3, 6, 16
3
Offset (5)
1
701
1001
9001
100001
101001
101501
300001
300501
400001
408001
409001
409501
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