Toshiba G7 Manuel d'utilisateur télécharger pdf (Page 49)

G7 ASD Multi-Protocol Communication Option and PG Feedback Option Manual

10.2.6 Programmable Pointer Registers

Modbus registers 0x0C00 ~ 0x0C1F (3072

~ 3103

) and 0x0C20 ~ 0x0C3F (3104

~ 3135

) are

collectively used by the Multicom Modbus interface as programmable pointer data and address

registers, respectively. Programmable pointer registers (PPR) allow the user to access non-consecutive

Modbus registers with only one Modbus transaction.

Registers 0x0C20 ~ 0x0C3F (the PPR “address” registers: 32 total) are used to define other Modbus

“data” registers: 32 total) are the actual registers used to access the data pointed to by the address

registers.

For example, if you would like to continuously read the data from ASD registers 0xFD00, 0xFE01,

0xFE04 and 0xFE05, the standard Modbus register configuration would require 3 read commands to be

issued: one reading 1 Modbus register starting at register 0x0D01, one reading 1 Modbus register

starting at register 0x0E02, and one reading 2 Modbus registers starting at register 0x0E05 (recall the

“+1” offset between drive and Modbus registers). To conserve network bandwidth and speed

processing time, however, the PPRs can be used to allow the same information to be accessed, but by

only issuing 1 command which reads 4 Modbus registers.

To configure this function, program as many address registers as necessary (up to 32) in the 0x0C20 ~

0x0C3F range with the Modbus register numbers you would like to continuously access. In this

example, we would write a value of 0x0D01 (the first Modbus register we want to access), to register

0x0C20, a value of 0x0E02 to register 0x0C21, a value of 0x0E05 to register 0x0C22, and a value of

0x0E06 to registers 0x0C23. The data located at the relevant drive registers can then be obtained by

accessing the corresponding data registers in the 0x0C00 ~ 0x0C1F range: data register 0x0C00

corresponds to address register 0x0C20, data register 0x0C01 corresponds to address register 0x0C21,

etc. Therefore, the 4 registers that are to be monitored can now be accessed simply by issuing 1 holding

be the data obtained from ASD registers 0xFD00, 0xFE01, 0xFE04, and 0xFE05 (in that order).

Notes:

•

PPR address register setting values are MODBUS registers. That is, Modbus registers = ASD

registers + 1.

•

PPR address registers are updated immediately when changed (no drive reset is required).

•

The values of the PPR address registers (0x0C20

∼

0x0C3F) are stored in the Modbus interface’s

nonvolatile EEPROM. Therefore, do not write to any of these registers more than 100,000 times.

Typically, these registers would only be written to once, when the drive and Modbus network are

first commissioned.

10.2.7 Response Delay Timer Function

As mentioned in section 8.2, ASD parameter F893 contains the setting for a response delay timer

function. This function is useful for applications where it may not be desirable for the Modbus interface

to respond immediately to the network after a read/write request. An example of this may be when a

radio modem that must be switched from receive mode to transmit mode is being used.

The response delay timer is adjustable in 10ms increments from 0s to 2.00s (factory setting = 0s). A

response delay of 0s means that there is no artificial delay inserted; response packets will be sent by the

Modbus interface as soon as they are available. When non-zero, the delay timer starts when a complete

packet is received, and a response will not be sent until the timer has expired (at a minimum). Note that

this time value only sets a minimum response delay value - depending on the quantity and location of

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 83 84

Commentaires sur ces manuels

Pas de commentaire

Toshiba G7 Manuel d'utilisateur Page 49

Commentaires sur ces manuels

Produits connexes et manuels pour Matériel Toshiba G7