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CHAPTER9 DEVICES
9
9.5 Module Access Devices
9.5.2 Cyclic transmission area device
9.5.2 Cyclic transmission area device
(1) Definition
The cyclic transmission area device is used to access the CPU shared memory of each CPU module in a multiple
CPU system.Note6
(2) Features
• The transfer speed is higher than the case of using the write (S.TO or TO) or read (FROM) instruction to the
CPU shared memory, resulting in reduced programing steps.
*1
• Using the cyclic transmission area device allows bit manipulation.
• By setting device comments for the cyclic transmission area device, program readability is increased.
• Because information on the CPU shared memory can be directly specified as an argument of the instruction,
no interlock device is required.
*1:In the High Performance model QCPU and Process CPU, buffer memory data cannot be written to the CPU shared memory
in host CPU using the cyclic transmission area device (U3En\G ).
(3) Specification method
Specify the I/O number of the CPU module and the CPU shared memory address.
For details of the cyclic transmission area device, refer to the following.
QCPU User's Manual (Multiple CPU System)
Note6
Figure 9.60 Specification method
Note9.6
For Redundant CPUs, the cyclic transmission area device cannot be used.
Redundant
Specification method:U3En\G
CPU shared memory (setting range: 0 to 4096, 10000 to 24335 in decimal)
Starting I/O number of the CPU module
Setting: First 3 digits of starting I/O number
CPU module mounting location:
* CPU slot (CPU No.1): 3E00
H
3E0
* Slot 0 (CPU No.2): 3E10
H
3E1
* Slot 1 (CPU No.3): 3E20
H
3E2
* Slot 2 (CPU No.4): 3E30
H
3E3
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