6. PROFIBUS COMMUNICATION
IMR01Y35-E3
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6.2.3 Dynamic data request
•
Dynamic data is that which is freely read/written from/to the PROFIBUS master such as the PLC.
The data item is freely selected by the sequence program.
•
As the Modbus register address is directly specified, data items of all the controllers connected to the
COM-JG can be selected.
•
When dynamic data is requested, 3-word (6-byte) data is used for both read and write.
Send data from PLC to COM-JG
Register configuration
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 0:
Specify an attribute of data. Only Bit 7 and Bit 6 are used.
Byte 0 (Attribute)
Bit 7 Bit 6
Bit 0
Byte 1:
Specify an accessing device address of controller.
Data range: 1 to 99 (“0” at Modbus is invalidated)
Byte 2, Byte 3: The communication item address of controller, to/from which data
is written/read is specified.
Z-TIO module Data address range:
0000H to 035BH
Z-TIO module Address range of memory area: 0500H to 0553H
Z-DIO module Data address range:
0000H to 00DBH
Byte 4, Byte 5: Write data of a communication item.
−
If Bit 7 in Byte 0 is set to “1: Data write,” data in the address specified by
Bytes 1, 2, and 3 is written.
−
If Bit 7 in Byte 0 is set to “0: Data read,” data in Byte 4 and 5 will be
ignored.
For communication item, refer to
7. COMMUNICATION DATA MAP (P. 28)
.
Attribute
Communication item
address
Communication item
data
Device
address
Unused (Any value, even if set, is ignored.)
Bit 6: Send data validate/invalidated discriminating bit
0: Send data is validated
1: Send data is invalidated
Bit 7: Read/Write discriminating bit
0: Data read
1: Data write
