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Configuring a Modicon Quantum Hot Standby with Unity System
Setting the Invalidate Keypad Option
Overview
The keypad is located on the front panel of the Modicon Quantum Hot Standby with
Unity 140 CPU 671 60 module.
Setting the Invalidate Keypad option can disable the Hot Standby submenu (PLC
Operations | Hot Standby). (See Accessing the Screens, p. 28) When the
Invalidate Keypad option is selected, the Hot Standby submenu is read only.
You may choose to prevent access to the Hot Standby control through the keypad
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Methods for
Selecting the
Invalidate
Keypad Option
to avoid the possibility of accidental (or malicious) state changing
for security or convenience
There are two methods for selecting/enabling this option:
Method Used
Description
Hot Standby tab
Select the Invalidate Keypad option in the Hot Standby tab using
the Unity Pro software. (See Using the Hot Standby Tab, p. 86)
Selecting the Invalidate Keypad option requires that the application
program be downloaded to the CPU.
Command Register
Set the system bit, %SW60.0 to 1.
Selecting the system bit %SW60.0 must be performed online in the
Primary controller.
Note: By setting the Invalidate Keypad option, the Run/Stop PLC control option on
the PLC Operation menu is NOT disabled.
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