Mitsubishi MELSEC-A AJ71PT3 User Manual page 27

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3. SPECIFICATIONS
(4) MINI link error detection (X6) .. ·.. ·.. ·Communication continued
On indicates that the master station has detected any error in
receive data from a remote I/O station.
(a) After X6 is switched on, its state depends on the mode setting
(Section 4.3.2) as follows:
• Automatic online return mode
X6 is switched off after communication is restored.
• No automatic online return mode
X6 remains on.
(b) The corresponding error code is stored to buffer memory
address 108 when X6 is switched on.
The error code is latched. For further details, see Section 3.4.
(5) MINI link communication error (X7)·········Communication stopped
On indicates that the master station is unable to communicate
with remote I/O stations.
(a) X7 is switched on when:
• Any remote I/O station power supply is switched off
• Any data link cable is broken
• A communication error has occurred with the mode setting
specified for communication stop at the time of online error
detection.
(b) The corresponding error code is stored to buffer memory
address 107 when X7 is switched on.
(6) MINI link communication start (Y18)
(a) Switch on to start I/O refresh.
(b) X1 is switched on to indicate normal communication with all
remote I/O stations.
(c) The FROM area (buffer memory addresses 70 to 192) is cleared
when Y18 is switched on.
(7)
I
FROM
VITQ]
instruction response designation (Y1A)
Defines priority of access to the master module buffer memory.
(a) Off indicates that the master module processing has priority.
I
(b) On indicates that the PC CPU's
I
FROM
[IQ]
instruction has
priority.
(c) The on/off status of Y1A defines the following:
FROMfTO Instruction Response
Designation (V1A)
OFF ON
hem
Access to buffer memory
Priority given to master module.
Priority given to PC CPU's
I
FROM
I
~ TO
I
instruction.
Receive (input) data read from
The
receive
data
refreshed at the
The receive data refreshed at diffe-
several stations by one
I
FROM
I
in-
same timing can be read.
rent timings may be read.
struction
There is a delay of (O.3ms
+
O.2ms
I
FROM
KIQJ
instruction processing
X (number of partial refresh stations No delay.
time
connected)) max.
Table 3.6 FROM/TO Instruction Response Designation
3-7
18 (NAl 66164·A