8-14 8. LS
Indirect Device Memory Designation
Using Q or I device memory
Using U device memory
15 8 7 0 15 8 7 0
n+0Model Device type n+0Model Device type
n+1 Address No. n+1 Lower address No.
n+2 Expansion code Bit designation n+2 Higher address No.
n+3 00 Station number n+3 Expansion code Bit designation
n+4 00 Station number
For the address number of 0 to 65535:
For the address number of 65536 or greater:
QW127.15.3
C (Address)
B (Slot No.)
A (Base No.)
Address number = A 64 + B 4 + C = 127 64 + 15 4 + 3 = 8191
Specify “8191” (DEC) for the address number.
- Word access
Q127.15.63
C (Address)
B (Slot No.)
A (Base No.)
Address number = A 64 + B 4 + (quotient of C divided by 16)
= 127 64 + 15 4 + (63 16) = 8191
Bit designation = remainder when C is divided by 16 = (63 16) = 15
Specify “8191” (DEC) for the address number, and “15” (DEC) for the bit designation.
- Bit access
UW7.15.31
C (Address)
B (Slot No.)
A (Base No.)
Address number = A 512 + B 32 + C = 7 512+ 15 32 + 31 = 4095
Specify “4095” (DEC) for the address number.
- Word access
U7.15.511
C (Address)
B (Slot No.)
A Base No.)
Address number = A 512 + B 32 + (quotient of C divided by 16)
= 7 512 + 15 32 + (51116) = 4095
Specify “4095” (DEC) for the address number, and “15” (DEC) for the bit designation.
- Bit access