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MELSOFT
8 ACCESSIBLE DEVICES AND RANGES
8 ACCESSIBLE DEVICES AND RANGES
This chapter describes the accessible devices and accessible ranges in each
communication form.
8.1 Precautions for Device Access
(1) About accessible devices
For accessible devices, the devices not given or devices marked
(inaccessible)
in the accessible device list indicated in Sections 8.2 and later are not supported
by MX Component.
Do not specify the inaccessible devices.
(2) Precautions for making access to extended file registers
It is possible (depending on the type of memory cassette mounted on the
programmable controller CPU) that no errors will occur even when a device is
read and written by specifying a block number which does not exist. In such a
case, the data read is not correct. Further, writing to that device may destroy the
user memory of the programmable controller CPU.
Make sure to use the function described here, after fully confirming the kind of
memory cassette, details of parameter setting, etc.
For details, refer to the AnACPU and AnUCPU User’s Manual.
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