Toshiba VF-A7 Instruction Manual page 34

3. Group read and write registers together in the programmable pointer list
and access them with separate Modbus commands. The ETH-100 can
process read requests and write requests faster when they are grouped together
rather than the master having to issue multiple transactions to access disjoint
registers. This is especially true when the registers to be accessed are also
configured as ASD scan registers. Pointer registers can be accessed in any
combination of starting register and length. In the setup below, you would
optimize ETH-100 efficiency by having two Modbus transactions: one read
request with a length of 6 starting at register FC00, and one write request with a
length of 2 starting at register FC08.
Table 5: Grouping Read and Write Registers In The PPR List
Modbus Pointer Registers
(Also configured to be ASD READ
scan registers)
Register
FC00
FC01
FC02
FC03
FC04
FC05
FC06
FC07
Points To...
FE03
FE06
FD01
FE02
FC91
FE04
33
Modbus Pointer Registers
(Also configured to be ASD
WRITE scan registers)
Register Points To...
FC08
FC09
FC0A
FC0B
FC0C
FC0D
FC0E
FC0F
FA02
FA01