IDEC MicroSmart Pentra - Manual (Page 92)

9: M ODBUS TCP C OMMUNICATION
9-4 W EB S ERVER CPU M ODULE U SER ’ S M ANUAL FC9Y-B1278
4. Configure the requests of the Modbus TCP Client.
A maximum of 255 requests can be entered in one request table. Specify the Modbus TCP servers with the remote host
numbers. After all requests are configured, click OK button to close the dialog box.
Choose to use Request Execution Devices and Error Status data registers. When using Request Execution Devices and
Error Status data registers, enter the first number of the devices.
5. Download the user program to the CPU module.
Now, programming for the Modbus TCP client is complete. Details about parameters and valid values are as follows.
Function Code
The MicroSmart accepts eight function codes as listed in the table below:
Function Code Data Size Slave Address MicroSmart as Modbus Slave
01 Read Coil Status 1 to 128 bits 000001 - 065535
Reads bit device statuses of Q (output), R (shift
register), or M (internal relay).
02 Read Input Status 1 to 128 bits 100001 - 165535
Reads bit device statuses of I (input), T (timer contact),
or C (counter contact).
03 Read Holding
Registers
1 to 64 words 400001 - 465535
Reads word device data of D (data register), T (timer
preset value), or C (counter preset value).
04 Read Input Registers 1 to 64 words 300001 - 365535
Reads word device data of T (timer current value) or C
(counter current value).
05 Force Single Coil 1 bit 000001 - 065535
Changes a bit device status of Q (output), R (shift
register), or M (internal relay).
06 Preset Single
Register
1 word 400001 - 465535 Changes word device data of D (data register).
15 Force Multiple oils 1 to 128 bits 000001 - 065535
Changes multiple bit device statuses of Q (output), R
(shift register), or M (internal relay).
16 Preset Multiple
Registers
1 to 64 words 400001 - 465535 Changes multiple word device data of D (data register).