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MELSEC-Q
7 FUNCTION
7.21 Module Service Interval Time Reading
The High Performance QCPU 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.
To read the module service interval time, operate the following special relay and
special registers.
(1) 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
(2) 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 to
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
(Program example)
When reading the module service interval time of the intelligent function module of
X/Y160
Stores module service interval time into D551, D552.
Read start signal
Sets I/O number 160 (hexadecimal) to SD550.
Starts module service interval time read.
POINT
To read the service interval time when access is made from GX Developer of the
other station on the network, set the I/O number of the network module.
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