Download Q Corresponding Ethernet Interface Module User`s Manual

6 DEDICATED INSTRUCTIONS
MELSEC-Q
POINT
The data read storage device (D1) requires a contiguous free area equal to or
greater than the length of the data read ((S) + 9) (maximum of 960 words).
1 The "Set by" column indicates the following:
• User: Data is set by the user before executing a dedicated instruction.
• System: The programmable controller CPU stores the execution result of a
dedicated instruction.
2 For a list of error codes, see Section 11.3.3 of the Q Corresponding Ethernet
Interface Module User's Manual (Basic)
3 It can be specified when the local station has an Ethernet module of function
version D or later. (Not available in any other case. Access to the target CPU is
required.)
4 Nothing is stored if the execution source detects an error when receiving an
instruction.
5 When the READ instruction is executed to the redundant system with a control
system or standby system CPU specified, the instruction may be unsuccessfully
completed due to system switching occurred on the target station (error code:
4244H, 4248H).
If this has occurred, execute the READ instruction again.
6 When data of more than 480 words is specified, a C084H error occurs on the local
station.
Check the read data length (1 to 480 words) and execute the READ instruction.
REMARKS
The allowable read data length ((S1)+9) of the READ instruction varies depending
on the version. (See the User’s Manual (Basic), Section 2.7.)
Specifying a length value outside the setting range will cause a 4101 error
(OPERATION ERROR) on the local station.
6 - 16
6 - 16