Mitsubishi Electric Melsec Q Series User Manual page 94

4 WHEN THE Q/LCPU ACCESSES THE PROGRAMMABLE CONTROLLER
OF ANOTHER STATION USING THE DATA LINK INSTRUCTION
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(2) Setting the arrival monitoring time of the control data storage
device
When the setting unit of arrival monitoring time is "1s", set a value greater than or
equal to the TCP resend timer value set in the initial processing parameter for the
arrival monitoring time designation area of the control data storage device.
When the monitoring time is equal to or less than the TCP resend timer value,
the TCP resend timer value is set as the arrival monitoring time. ( 1)
(When the setting value is less than or equal to the TCP resend timer value, the
arrival monitoring timer equals the TCP resend timer value.)
1 Although the units of setting values for the TCP resend timer (setting value
units: 0.5 s) and the arrival monitoring timer (setting value units: s) are
different, the TCP resend timer value is used as is.
(3) Checking the execution result of each data link instruction
The execution result (completion status) of each data link instruction is stored in
the areas shown as binary values.
After the execution of an instruction is completed, read the execution result from
the storage area and verify either normal or abnormal completion.
Stored value at normal completion : 0
Stored value at abnormal completion: A value other than 0 (error code)
When an error code that indicates abnormal completion is stored, take an action
by seeing the "Troubleshooting" section in the User's Manual (Basic).
Instruction
SEND
RECV, RECVS
READ, SREAD
WRITE, SWRITE
REQ
ZNRD
ZNWR
(4) Clock data when each of the data link instructions ends abnormally
In the clock data stored as control data when each of the data link instructions
ends abnormally (set only upon an error), the year data (upper 2 digits) is stored
only when the Q/LCPU is the error detection station. If the error detection station
is not a Q/LCPU, 00
Storage area of execution result
The completion status storage device of the control data storage
device of the instruction used.
Data link instruction execution result
storage area in buffer memory
is stored.
H
MELSEC-Q/L
Address CF (207)
H
Address D1 (209)
H
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