Mitsubishi 00JCPU User Manual page 380

9.2 Internal User Devices
(1) Definition
Internal user devices can be used for various user applications.
(2) Points for internal user devices
The default values can be changed in the Device tab of the PLC parameter dialog box.
However, the points for the input (X), output (Y), step relay (S), link special relay (SB), and link special register
(SW) cannot be changed.
When changing device points, note the following.
• Set each device in increments of 16 points.
• The maximum number of points for a bit device is 32K.
• The maximum number of total points for all internal user devices varies depending on the CPU module.
• Basic model QCPU: 16.4K words
• High Performance model QCPU, Process CPU, and Redundant CPU: 29K words
• One point set for a timer, a retentive timer, or a counter is regarded as one point for a word device plus two
points for a bit device.
●
When changing device points, the following refresh ranges must not exceed the corresponding device ranges.
• Refresh range of network module
• Auto refresh range of intelligent function module
If device points are set exceeding the corresponding device range, data may be written to any other device or an error
may occur.
●
The total number of points for the internal relay, latch relay, annunciator, edge relay, link relay, link special relay, step
relay, timer, retentive timer, and counter is up to 64K points.
●
If the device points of the internal user devices are changed and the parameters are written from the "Write to PLC"
screen, the device address may be shifted and does not correspond to the original stored value. Because the shifted
value might be used for the operation, the following files, which are created by using the parameters before the device
point change, cannot be used under existing condition.
• Sequence program files
• SFC program files
• ST program files
●
When change the device points of the internal user devices, perform the following operations from GX Developer.
[Before changing the device points of the internal user devices]
Read devices to be used and each program from the CPU module.
[After the device points of the internal user devices are changed]
Write the devices and each program, which were read before the device point change, to the CPU module.
For the read/write of devices and programs, refer to the following.
GX Developer Version 8 Operating Manual
9 - 5
Figure 9.1 Device tab of the PLC parameter dialog box
Default
Most of the default device
points can be changed.