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9-2
9.1 Writing to the CPU Shared Memory of Host CPU
The S.TO or TO instruction is used to write to the CPU shared memory of the host station in the
multiple CPU system.
The following table indicates the usability of the S.TO and TO instructions.
(1) Operation of S.TO instruction
The S.TO instruction can write data to the CPU shared memory of the host CPU module.
The following figure shows the processing performed when the S.TO instruction is executed
in CPU No. 1.
CPU Module Type Name S.TO Instruction TO Instruction
Basic model QCPU Q00CPU, Q01CPU
Usable Usable
High Performance model QCPU
Q02CPU, Q02HCPU,
Q06HCPU, Q12HCPU,
Q25HCPU
Usable Unusable
Process CPU
Q02PHCPU, Q06PHCPU,
Q12PHCPU, Q25PHCPU
Usable Unusable
Redundant CPU Q12PRHCPU, Q25PRHCPU
Unusable Unusable
Universal model QCPU
Q00UCPU, Q01UCPU,
Q02UCPU, Q03UDCPU,
Q04UDHCPU, Q06UDHCPU,
Q10UDHCPU, Q13UDHCPU,
Q20UDHCPU, Q26UDHCPU,
Q03UDECPU,
Q04UDEHCPU,
Q06UDEHCPU,
Q10UDEHCPU,
Q13UDEHCPU,
Q20UDEHCPU,
Q26UDEHCPU
Usable Usable
[ SP.TO H3E0 n2 n3 n4 D ]
Device
memory
CPU
shared
memory
Device
memory
Buffer
memory
CPU
shared
memory
CPU No. 1
CPU No. 2
Intelligent
function module
Data
write
Designation of CPU shared memory in CPU No. 1