Configuration Guidelines

To configure the I/O Link(s) in a PLC system, enter constant data values into the appropriate %P registers. These values determine:

HThe number of I/O Link Interface Modules in the PLC.

HThe rack and slot location of each I/O Link Interface Module.

HThe data length for each slave device (32 or 64 for a Power Mate).

HThe beginning address in PLC %I memory for input data.

HThe beginning address in PLC %Q memory for output data.

This must be done before the start command is issued to any I/O Link Interface Module (as explained later in this chapter).

Program references for the I/O Link Program Blocks are listed in the table opposite.

Specify the Number of I/O Link Modules

The total number of modules specified in %P must be compatible with the Program

Block being used:

A.for LINK73X, %P00001 must be 1

B.for LINK77X, %P00001 may be 1 or 2

C.for LINK78X, %P00001 may be 1 to 4

Configuring the I/O Link Module as a Master

If the I/O Link Interface Module is a master, specify a data length and references for each slave on the I/O Link. The data length (I/O count) for each device must be 0, 32, or 64. No other values are correct.

The starting %I and %Q addresses must be compatible with the Program Block being used:

A.for LINK73X, the range is (1 to 481) or (1 to 449)

B.for LINK77X, the range is (1 to 2017) or (1 to 1985)

C.for LINK78X, the range is (1 to 4065) or (1 to 4033)

Configure all devices to have consecutive numbers; do not leave any ªholesº in the configuration for a module. If a 0 is configured for a slave's data length, the data lengths of all subsequent slaves on the same link must also be 0.

Note

All %P references from %P0009 through %P0209 which are not used for the application must be set to 0 before the link is activated.

Configure all %I and %Q starting addresses at word boundaries.

Configuring the I/O Link Module as a Slave

If the module is a slave, configure it to be Device 0. Specify its data length (32 or 64) and references.

Assign a starting %I and %Q address for the module that is compatible with the

Program Block being used. The %I and %Q addresses must begin on word boundaries.

Set to 0 the unused %P references for devices 1 through 15. See ªConfiguring the I/O

Link Module as a Masterº, above.

GFK±0644

Chapter 4 Programming Guide