User`s guide

General
Mitsubishi Electric, MA00759F 15
How to Make the Communication More Efficient
Group Controller Signals Consecutively
Signals from the controller are read most rapidly if all signals in the list above are con-
secutive. If for example, 100 signals are defined, the quickest way to read these is to
link them, for example, M0.0-M11.7. If the signals are spread (e.g. I0.4, Q30.0,
M45.3 etc.) the updating is slower.
Efficient Block Changes
Block changes are carried out most rapidly and efficiently through the block jump
function on the function keys or through a jump object. Display signals in block
properties should only be used when the controller is to force the presentation of an-
other block. The New display register can also be used if the controller is to change
the block. This does not affect communication as much as a larger number of Dis-
play signals.
Use the Clock in the Operator Panel
An extra load is put on communication if the clock in the controller system is used,
since the clock register must be read up to the operator panel. Downloading of the
clock to the controller also creates an extra load. The interval between downloads
should therefore be as long as possible.
Packaging of Signals
When signals are to be transferred between the operator panel and controller, they
are not all transferred at the same time. They are divided into packages, each contain-
ing a number of signals, instead. The number of signals in each package depends on
which driver is used.
To make communication as fast as possible the number of packages has to be mini-
mized. Consecutive signals require a minimum number of packages, but it is perhaps
not always possible to program it this way. In such cases there is a “waste” between
two signals. This gap in the maximum distance between two signals which can still
be kept in the same package. The size of the gap depends on which driver is used.
Signal
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Used
XX XXX
Waste