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SHEETDESCRIPTIONDESIGN DATE EDIT
01 Mutai Newl
re
istered
TITLE: Additional explanation of
PROFIBUS-DP Master function
(I/O Module Assignment function)
B-62924EN/04-1
FANUC LTD.
02.10.7
DRAW.NO.
1.2.6 Updating DI/DO Data for the Master Function
When making a ladder program, fully consider “Data refresh time”, “Data simultaneity”
and “Relation with ladder program” described below.
Data refresh time
The data refresh time for the master function means the time required for updating DI/DO
data for all slave stations that is allocated in the R area of the PMC by address
assignment.
NOTE
-The processing time of a ladder program is not included in the data
refresh time.
-It should be considered that the reaction time is twice data refresh
time at the best. (The reaction time is until receiving the response as
DI data after sending request as DO data.)
-DI/DO data means all DI/DO data of the available slots which are
included in available slaves.
Available slaves are marked with “*” at the position [NO] of the Slave
index screen.
Available slots are marked with either of “---“, “I/O”,”I/-“,”-/O” or “-/-“ at
the position [MOD] of the DI/DO address screen.
When only the master function is used
The data refresh time for the master function is indicated at REFRESH TIME on Screen
1-2.
REFRESH TIME : XXX MSEC ([XXX + XXX] is for maintenance data.)
It is displayed with three digits. If the number of digits is exceeded, OVR or OVER is
displayed, but it does not affect communication.