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8

8.4

Checking the Program for Refresh

This section explains how to check the program for refresh and for receiving LRDP/LWTP 
instruction. 

Execute the program at the beginning of the sequence scan.
When using the example program introduced in this manual, do not change it except for 
the following.(

CHAPTER 7 PROGRAMMING)

 • Change the I/O signals and intelligent function module device I/O numbers 

depending on the module position.

 • Change the link data refresh destination to prevent duplication with a device of 

the CPU module, which is used for refresh parameters for the MELSECNET/H 
network module.

Host station remains 
disconnected, not starting data 
communication (cyclic 
transmission) with other 
stations.

Is CPU operating status (DY10) ON?

Turn ON CPU operating status (DY10).

Is host station CPU module in STOP status?

Set host station CPU module to RUN.

Is it in offline status (X0=ON)?

•Set it to online status (Set Mode setting switch to 0 

or 1.)

•Check station No., mode setting, and 

communication speed setting.

Link data of host station 
(normal) not sent to other 
stations.

Is link data refresh destination duplicated with CPU 
module device, which is used for refresh 
parameters of MELSECNET/H network module?

Change refresh destination of link data.

Was Refresh request (DY16) turned ON from OFF 
after termination of refresh?

•After termination of refresh, reset Refresh request 

(DY16) and set it again.

•Always use direct access output (DY16).

Is each station send range stored in Refresh 
information table (Buffer memory address: 2

H

 to 

27

H

)?

While Refresh ready status (X7) is OFF, turn ON 
Refresh request (DY16).

In spite of latch setting of host 
station B/W devices, 0 data 
(OFF data) are sent to other 
stations.

Were initial B/W device values transferred to local 
module before data communication with other 
stations?

Transfer initial B/W device values to local module 
before data communication with other stations.

After B/W initial value setting status (X1) turned ON, 
was CPU operating status (DY10) turned ON?

After B/W initial value setting status (X1) turned ON, 
turn ON CPU operating status (DY10).

Long sequence scan
(Link refresh time is longer than 
calculated time.)

Was Refresh in execution (DY11) turned ON before 
starting refresh?
Also, was Refresh in execution (DY11) turned OFF 
after termination of refresh?

•Before starting refresh, turn ON Refresh in 

execution (DY11).

•When terminating refresh, reset Refresh in 

execution (DY11).

•Always use direct access output (DY11).