Filter
Top Products
7
ONLINE MODULE CHANGE
7 - 1
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
PROCEDURES AND
SETTINGS BEFORE
SYSTEM OPERATION
5
UTILITY PACKAGE
(GX CONFIGURATOR-TI)
6
PROGRAMMING
7
ONLINE MODULE
CHANGE
8
TROUBLESHOOTING
CHAPTER7 ONLINE MODULE CHANGE
When changing a module online, carefully read the "Online module change" section of the
QCPU User's Manual (Hardware Design, Maintenance and Inspection).
This chapter describes the specifications of online module change.
(1) Perform an online module change operation using GX Developer.
(2) Dedicated instructions or the user range save/restore functions which
read/write data from/to buffer memory are provided so that re-setting of
offset/gain values can be performed easily.
POINT
(1) Make sure that the system outside the programmable controller will not
malfunction before performing online module change.
(2) To prevent an electric shock and malfunction of operating modules, provide
means such as switches for powering OFF the external power supply of the
module to be changed online and the power supply for external devices,
individually.
(3) After the module has failed, data may not be saved properly. Referring to
Section 3.4.25, take a note of values to be saved in advance (such as Factory
default offset/gain values, User range settings offset/gain values, User range
settings resistance offset/gain values in buffer memory (Un\G190 to
Un\G253)).
(4) It is recommended to perform online module change in the actual system in
advance to ensure that changing a module would not affect the operation of
the modules not targeted for online module change by checking the following:
• Means of disconnecting external devices and its configuration are correct.
• Switching ON/OFF does not bring any undesirable effect.
(5) Do not install/remove the module to/from the base unit more than 50 times
after the first use of the product. (IEC 61131-2 compliant)
Failure to do so may cause malfunction.
(Note)
Dedicated instructions cannot be executed during online module change. When using
dedicated instructions to save/restore the setting values, execute them in a separate
system*.
If a separate system is unavailable, restore values by writing them to the buffer
memory.
* Even when the module is mounted to the remote I/O station, use dedicated instructions to save/
restore the setting values in a separate system where the module is mounted on the main base
unit. (Data cannot be saved/restored in a separate system mounted on the remote I/O station.)