6
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6.25 Reading the Module Service Interval Time
6
FUNCTIONS
6.25 Reading the Module Service Interval Time
The module service interval indicates the time between a transient request such as
monitor, test, program read/write.
The CPU module can monitor the service interval time (time from service acceptance to
next service acceptance) of the intelligent function module, network module or GX
Developer.
This indicates the frequency at which access to the CPU occurs from outside.
(1) Reading method
To read the module service interval time, operate the following special relay and
special registers shown in Table6.50 and Table6.51.
Table6.50 Special relay
Number Name Description
SM551
Module service interval time
read
Turning this relay from OFF to ON reads to SD551
and SD552 the module service interval time of the
intelligent function module specified in the special
register SD550.
ON: Read
OFF: No processing
Table6.51 Special registers
Number Name Description
SD550
Module service interval time
measured module
Set the I/O number of the module whose module
service interval time will be measured.
Set the I/O number of the peripheral device
connected to the RS-232 or USB interface of the
CPU module to FFFF
H
.
SD551,
SD552
Module service interval time
Stores the service interval time from the module
specified in SD550 when SM551 is turned on.
SD551: 1ms units (range 0 to 65535)
SD552: 100 s units (range 0 to 900, stored
at intervals of 100 s)
(Example) When module service interval time is
123.4ms
SD551 = 123, SD552 = 400
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