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10.3 Programming Using MELSEC Data Link Functions
10.3.11 Device types for MELSEC data link functions
10
FUNCTIONS AND PROGRAMMING
(c) Message reception
* 1 Device name specification (macro) is defined in the included file "MdFunc.h" of the MELSEC data
link functions. ( Section 10.2.3 (1) )
POINT
1. For the link device internal buffers (LX buffer, LY buffer, LB buffer and LW
buffer), set the link device refresh cycle( Section 9.4.6 (1) )and range
( Section 9.4.6 (3) )on the MELSECNET/H utility to execute link device
refresh between the link device internal buffers and link devices (LX, LY, LB
and LW).
2. The link devices (SB, SW) are accessible only by direct access.
Since link device refresh is not executable by the MELSECNET/H utility
setting (the link device refresh cycle and range settings), access using the link
device internal buffers is not allowed.
Remark
Refer to Section 4.4.2 for the link device access method.
Table10.19 Device types for message reception
Device type
Device
Code specification Device name
specification
*1
DEC. HEX.
101 65
H DevMAIL Q/QnA SEND function (with arrival confirmation) and RECV function
102 66H DevMAILNC Q/QnA SEND function (no arrival confirmation)
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