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3.6 Details of Buffer Memory
3.6.4 LRDP instruction receive request/receive result/work area
3
SPECIFICATIONS
(1) LRDP instruction receive request (Buffer memory address: ACH)
The receive request for the LRDP instruction is stored.
4: Processing requested (System sets it when LRDP instruction is accepted.)
5: Processing completed (User has to set it after the read data is stored.)
Other than the above: No request
(2) LRDP instruction work area (Buffer memory address: B0H to D7H)
When the LRDP instruction receive request (buffer memory address: ACH) is "4", the
requested content of the LRDP instruction is stored into the following area.
1) Read the read data (buffer memory address: B4
H to D7H) of a local module to
the devices of the CPU module using the following area in a sequence
program.
2) After reading data, set "5" to the LRDP instruction receive request (buffer
memory address: AC
H).
3) Send the data which is stored in the read data (buffer memory address: B4
H to
D7
H) to the master station.
* 1 Stored value when start device is D100
Table 3.12 LRDP instruction work area
Address
Hexadecimal
(Decimal)
Item Description
B0H(176)
Read start device name
*1
Stores a start device name (device code) of the CPU module.
544E
H: T
434E
H: C
4420
H: D
5720
H: W
B1H(177)
Read start device No.
*1
Stores a start device No. of the CPU module.
B2H(178) System area (Use prohibited) -
B3H(179) Read data length
Stores the number of data to be read.
1 to 32 (Word)
B4H to D7H
(180 to 215)
Read data Stores the data to be read.
Table 3.13 Stored value when start device is D100
Address
Hexadecimal
(Decimal)
Item (description) Stored value
B0H(176) Read start device name (D) 4420H
B1H(177) Read start device No. (100) 0064H