17.4
Device Memory Read and Write
This section explains the specification content and examples of the control procedure when reading from/writing to the device
memory are as shown below.
For the message formats other than request data and response data, refer to the following sections.
Page 344 Message Format, Page 346 Details of Setting Data
To read and write the extended file register, use the commands dedicated to the extended file register.
Page 371 Read and Write Extended File Register
Considerations
The considerations when reading/writing device memory using the commands described in this section.
Considerations when accessing devices other than ACPU module
■Accessible devices
Only the devices with the same names that exist in ACPU can be accessed within the device range of AnACPU.
Page 352 Accessible device range
The following devices cannot be accessed from the external devices:
• Added devices
• Latch relay (L) and step relay (S)
• File register (R) of QnACPU
*1 Even when the latch relay (L) or step relay (S) is specified, the internal relay (M) can be accessed.
■Special relays and special registers
Special relays and special registers can be accessed within the following range.
• Access SM1000 to SM1255 by specifying M9000 to M9255.
• Access SD1000 to SD1255 by specifying D9000 to D9255.
■Universal model QCPU
Use the Universal model QCPU with a serial number whose first five digits are '10102' or later.
As for the serial number whose first five digits are '10101' or earlier, access using 2C/3C/4C frame.
17 COMMUNICATING USING 1C FRAMES
350
17.4 Device Memory Read and Write
*1