Schneider Electric LUFP9 user manual Numparam

9. Appendix C: Practical Example (RSLogix 500)

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

Address	Symbol	Description
B3.0/0	RD_RUNNING	Reading a parameter on all TeSys U motor starters: In progress
		Reading a parameter on all TeSys U motor starters: Reading is correct (OK) or
B3.0/1	RD_OK_KO	incorrect (KO) for a motor starter (if the response has arrived or when timeout
		T4:0 is triggered)
B3:0/5	————	The “trigger byte” of the query has been updated: Yes (1) / No (0)
		Reading a parameter on the TeSys U motor starters: Counter. When the value
C5:0	CPT_RD_TESYS_U	of this counter reaches 9, the process of reading a parameter on all of the
		TeSys U motor starters is halted.
		Result of reading a parameter: Slave (16#01 to 16#08) as MSB. The value of
I:1.10	CR_RDPAR_XXX_SLAVE	this field is compared to that of the corresponding field in the query frame. The
		LSB of this input word is not used.
		Result of reading a parameter: Function (always 16#03) as LSB (the value of
I:1.11	CR_RDPAR_FCT_BYTES	this field is compared to that of the corresponding field in the query frame) +
		number of bytes read (16#02) as MSB (value masked and checked).
		Result of reading a parameter: Value of the parameter read (MSB and LSB
I:1.12	CR_RDPAR_VALUE	are swapped). This value is placed in array N7:[N7:2], then its MSB and its
		LSB are swapped there in order to restore the correct value of the read
		parameter.
N7:1	NUMPARAM	User command: Number of the read parameter.
N7:2	RD_INDEX	Index in the array of results for the reading of a TeSys U parameter. Value = 4
		to 11 (motor starters nos. 1 to 8).
N7:3	ADDRESS	Address of the Modbus slave for which one of the parameters is currently
		being read. Value = 1 to 8.
		Array of results used for the reading of a TeSys U parameter (motor starters
N7:[N7:2]	— [ RD_INDEX ]	nos. 1 to 8). Elements N7:4 to N7:11 (see N7:2). Value = –1 in case of error
		(response timeout triggered).
N7:36	————	Local counter that corresponds to the “trigger byte” of the read request.
N9:0	VAR_TEMP_1	Temporary scratch variable used to carry out intermediate evaluations.
O:1.10	RDPAR_SLAVE_FCT	Request for the reading of a parameter: Slave (from 16#01 to 16#08) as LSB
		+ function (always 16#03) as MSB.
O:1.11	RDPAR_ADRPAR	Request for the reading of a parameter: Address of the parameter (copied
		from N7:1, but with MSB and LSB swapped).
		Request for the reading of a parameter: Number of parameters to be read
O:1.12	RDPAR_NBPARS	(always 16#0001, but with the MSB and LSB swapped, that is to say
		16#0100).
T4:0	TIMEOUT_RD_PARAM	Timer for the timeout of the parameter reading command (3 seconds)

The example includes a personalized screen for monitoring the data, called “CDM 1 - RD_PAR”, in order to simplify the use of this example. The content of this screen is shown below:

Address	Symbol	Display
N7:1	NUMPARAM	Decimal
B3:0/0	RD_RUNNING	Binary
B3:0/1	RD_OK_KO	Binary
N7:2	RD_INDEX	Decimal
N7:3	ADDRESS	Decimal
N7:4	RDPAR1	Decimal
N7:5	RDPAR2	Decimal
N7:6	RDPAR3	Decimal
N7:7	RDPAR4	Decimal
N7:8	RDPAR5	Decimal
N7:9	RDPAR6	Decimal

Address	Symbol	Display
N7:10	RDPAR7	Decimal
N7:11	RDPAR8	Decimal
O:1.10	RDPAR_SLAVE_FCT	Hexadecimal
O:1.11	RDPAR_ADRPAR	Decimal
O:1.12	RDPAR_NBPARS	Hexadecimal
I:1.10	CR_RDPAR_XXX_SLAVE	Hexadecimal
I:1.11	CR_RDPAR_FCT_BYTES	Hexadecimal
I:1.12	CR_RDPAR_VALUE	Hexadecimal
I:1.16	TRIGGER_IN_RD_WR	Hexadecimal
O:1.16	TRIGGER_OUT_RD_WR	Hexadecimal
N7:36	————	Hexadecimal
B3:0/5	————	Binary

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