Chapter 3: Modicon PLCs Using Modibus Plus
39
Note:
For a Operator Station to read data from another Operator Station, the routing address after
the Operator Station address should be set to 1.
Data Block Size -
This represents the length of the data block (must match the third word of the
control block 4TTTT+2).
00ZZZ
Length of the data block (1-100).
For more information concerning Modicon function blocks, consult Modicon’s 984 Programmable
Controller Systems Manual.
Maintenance Access
The Maintenance Template or Page will access all memory locations supported by the PLC driver as
defined in this manual. When running online, you may change the PLC reference. You must enter the
correct mnemonics and numeric values and create a legal reference to change a PLC reference.
Note:
When a new reference is entered on a Operator Station, the Maintenance Template will
remain in a paused state until the
Start Monitor
control button is pressed. When the
Start
Monitor
control button is pressed, the Operator Station will parse the reference. (Parsing
means checking the syntax and range of the reference to ensure that it is supported by the
driver.)
