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MELSEC-Q
6 PROGRAMMING
6.2 Cyclic Transmission
Depending on the timing of the link refresh, 32-bit (2-word) type link data may be
broken up into new and old data in units of 16 bits (one word).
• Current values of analog-digital converter module
• Current values of positioning module, command speed.
The remote I/O network provides the following functions for making handling of the link
data easy.
• 32-bit data guarantee
: Section 6.2.1
• Block guarantee of cyclic data per station
: Section 6.2.2
6.2.1 32-bit data guarantee
32-bit data precision is guaranteed automatically by setting parameters so that the
following conditions 1) to 4) are satisfied.
If conditions 1) to 4) are not satisfied, a warning for 32-bit data separation is displayed
during setting with GX Developer.
1) The start device number of LB is a multiple of 20
H.
2) The number of assigned LB points per station is a multiple of 20
H.
3) The start device number of LW is a multiple of 2.
4) The number of assigned LW points per station is a multiple of 2.
Parameter settings for network range assignments
Refreshing link devices that satisfy the above conditions 1) to 4) guarantees
consistency of 32-bit data.
POINT
To guarantee data larger than 32 bits (2 words), use the station unit block
assurance in Section 6.2.2.