Schneider Electric LUFP7 user manual Deleting Aperiodic Parameter Data, QW4.0.16, QW4.0.17

6. Configuring the Gateway

Service	PLC output	Description
		Bit 15....................Bit 8		Bit 7......................Bit 0
Managing the downstream Modbus network	%QW4.0	Profibus-DP master control word
	%QW4.0.1	Value of the motor starter c command register
Periodic communications	%QW4.0.2	Value of the motor starter d command register
	%QW4.0.3	Value of the motor starter e command register
—	%QW4.0.40	Free memory location
Controlling	%QW4.0.5	Value of the motor starter g command register
TeSys U motor starters	%QW4.0.6	Value of the motor starter h command register
	%QW4.0.7	Value of the motor starter i command register
	%QW4.0.8	Value of the motor starter j command register
Aperiodic communications	%QW4.0.9	Slave number		Function number
—		(16#01-16#08)		(16#03)
Reading the value of a	%QW4.0.10	Address of the parameter	to be read (16#xxxx)
motor starter parameter (QUERY)	%QW4.0.11	Number of parameters to be read (16#0001)
Aperiodic communications	%QW4.0.12	Slave number		Function number
—		(16#01-16#08)		(16#06)
Writing the value of a	%QW4.0.13	Address of the parameter	to be written (16#xxxx)
motor starter parameter (QUERY)	%QW4.0.14	Value of the parameter to be written (16#xxxx)
Aperiodic communications	%QW4.0.15	Read parameter		Write parameter
(“Trigger bytes” for the queries)		query counter		query counter
Periodic communications	%QW4.0.16	Value of the
		“Command Register”
—
	%QW4.0.17	Value of the
Controlling motor starter TeSys U f
		“2nd Command Register”

8)Transferring the Profibus-DP coupler configuration: Once changes have been made to the Profibus-DP coupler configuration, it is necessary to validate the hardware configuration of the PLC rack, and to transfer the whole application to the Premium PLC on which the coupler is located. Please see chapter 4.2.13 Using and Monitoring the TSX PBY 100 Coupler Configuration, page 36.

6.9. Deleting Aperiodic Parameter Data

If your PLC application does not need the aperiodic service for reading/writing parameter data on Modbus slaves, you can delete the associated commands. If you also intend to add Modbus data, and therefore use new locations in the gateway’s memory, it is preferable to delete the aperiodic commands from the start, so that you can reuse the memory locations.

However, if you don't need to use the aperiodic service for parameter data under PL7 PRO, you don’t need to change the gateway configuration nor the Profibus-DP coupler configuration for the gateway, as both should be equivalent (same numbers of inputs and outputs). Do not conduct any of the operations described here. The Modbus exchanges related to this setting shall not be carried out if the related data are not changed by the Profibus-DP master PLC. So deleting associated Modbus commands becomes optional.

The operations you will need to carry out are described in order below:

1)Displaying parameter data commands: Select the very first node of the downstream Modbus network, “TeSys U n°1”, and expand the tree structure showing its commands and transactions. The screen should look like the one at the top of the next page.

64