Modbus Tcp Server - IDEC FT1A Series User Manual

11: M C
ODBUS OMMUNICATION

Modbus TCP Server

When the SmartAXIS is configured as the Modbus TCP server, Modbus TCP client devices can read/write data to the SmartAXIS.
When the SmartAXIS receives a valid request from a Modbus TCP client device, the data is read or written according to the request
received. The communication data received from Modbus TCP clients is processed at the END processing of the user program.
Modbus TCP Server Specifications
Slave Number
Response Time
Number of Clients that can Access Simultaneously
Port Number
Supported Function Code
Address Map
Modbus TCP client can access the Modbus devices (Coil, Input Relay, Input Register, and Holding Register) of Modbus server to
read or write the device data (I, Q, M, R, T, C, and D) of SmartAXIS. Refer to the following table to configure the Modbus TCP
clients.
Modbus Device Name
Coil
(000000 and above)
Input Relay
(100000 and above)
Input Register
(300000 and above)
Holding Register
(400000 and above)
*1: 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. For details, see "Modbus Slave Communication" on
page 11-8.
*2: Access within the device range for the SmartAXIS type used.
11-24
Parameter
Modbus Address
Map (Decimal)
000001 - 000112
000701 - 000828
001001 - 002024
009001 - 009144
100001 - 100126
101001 - 101200
101501 - 101700
300001 - 300200
300501 - 300700
400001 - 402000
408001 - 408200
409001 - 409200
409501 - 409700
S AXIS P
MART
Ignored
1.5 ms
3 (1 client per 1 connection)
502 (can be changed between 0 and 65535)
01 Read Coil Status
02 Read Input Status
03 Read Holding Registers
04 Read Input Registers
05 Force Single Coil
06 Preset Single Register
15 Force Multiple oils
16 Preset Multiple Registers
Communication
*1
Frame Address
0000 - 006F Q0 - Q141
02BC - 033B R0 - R127
03E8 - 07E7 M0 - M1277
2328 - 23B7 M8000 - M8177
0000 - 007D I0 - I155
03E8 - 04AF T0 - T199 (timer contact)
05DC - 06A3 C0 - C199 (counter contact)
0000 - 00C7 T0 - T199 (timer current value)
01F4 - 02BB C0 - C199 (counter current value)
0000 - 07CF D0 - D1999
1F40 - 2007 D8000 - D8199
2328 - 23EF T0 - T199 (timer preset value)
251C - 25E3 C0 - C199 (counter preset value)
/L U ' M FT9Y-B1378
RO ITE SER S ANUAL
Modbus TCP Server
*2
SmartAXIS Device
Applicable
Function Code
1, 5, 15
2
4
3, 6, 16
3