Schneider Electric LUFP9 user manual Wrrunning

9. Appendix C: Practical Example (RSLogix 500)

•Management of the response timeout (T4:1). Until the response arrives or if its content is incorrect (bit B3:0/4 = 0), a 3-second timer is set. When this timeout (T4:1/DN = 1) is triggered, the timer is reinitialized, the parameter’s address (O:1.14, after LSB / MSB have been swapped using scratch variable N9:0) and an erroneous value (N9:1 = –1) are placed in the array of results, into two successive locations, reserved for the motor starter currently being polled. Finally, the write process is halted (bit B3:0/3 is reset).

The various data used by this sub-program are shown in the following table:

Address	Symbol	Description
B3:0/2	WR_COMMAND	User command: Writing a parameter on a TeSys U motor starter.
		This bit is activated by the user and reset by the program.
B3.0/3	WR_RUNNING	Writing a parameter on a TeSys U motor starter: In progress
B3.0/4	WR_OK	Writing a parameter on a TeSys U motor starter: Writing OK (if the
		response has arrived and is correct)
B3.0/6	————	The “trigger byte” of the query has been updated: Yes (1) / No (0)
I:1.13	CR_WRPAR_SLAVE_FCT	Result of writing the value of a parameter: Slave (16#01 to 16#08)
		as LSB + function (always 16#06) as MSB. The values of these
		fields are compared to those of the query
I:1.14	CR_WRPAR_ADRPAR	Result of writing the value of a parameter: Address of the
		parameter. The value of this field is compared to that of the query
		(swapping of the MSB and the LSB with each of these two fields)
I:1.15	CR_WRPAR_VALUE	Result of writing the value of a parameter: Value of the written
		parameter. The value of this field is compared to that of the query
		(swapping of the MSB and the LSB with each of these two fields)
N7:12	WR_SLAVE	User command: Modbus address of the motor starter to which the
		write request should be sent.
		User command: Address of the parameter
N7:13	WR_ADDRESS	N.B. Do not attempt to change the value of register 704 (command
		register), because it is already controlled by the DeviceNet master
		(see sub-program “LAD 3 - CMD_MON”)!
N7:14	WR_VALUE	User command: New value of the parameter
		Index in the array of results for writing TeSys U parameters (motor
N7:15	WR_INDEX	starters nos. 1 to 8).
		Value = 16 + 2 × (motor starter no. – 1) = 16 to 30
		Array of results for writing TeSys U parameters (motor starters nos.
		1 to 8). Elements N7:16 to N7:31 organized by “parameter address”
N7:[N7:15]	— [ WR_INDEX ]	/ “parameter value” pairs, each pair occupying two successive
		addresses.
		“Parameter value” = –1 if there is an error (response timeout
		triggered).
N7:37	————	Local counter that corresponds to the “trigger byte” of the read
		request.
N9:0	VAR_TEMP_1	Temporary variables used to carry out the intermediate evaluations
N9:1	VAR_TEMP_2	(primarily LSB / MSB swappings).
O:1.13	WRPAR_SLAVE_FCT	Request for writing the value of a parameter: Slave (copied from
		N7:12) as LSB + function (always 16#06) as MSB.
O:1.14	WRPAR_ADRPAR	Request for writing the value of a parameter: Address of the
		parameter (copied from N7:13, but with MSB and LSB swapped).
O:1.15	WRPAR_VALUE	Request for writing the value of a parameter: Value of the parameter
		(copied from N7:14, but with MSB and LSB swapped).

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