FM26001c_e.doc / Nov-11
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5. Keypad Operation
A summary of all parameters and a detailed description of parameter functions is available under
section 6.
For all operation, the units provide four front keys which subsequently will be named as shown
below:
PROG
UP
DOWN
ENTER
The key functions depend on the actual operating state of the units. Basically we have to distinguish
between Normal Operation and Setup Operation
5.1. Normal Operation
While in normal operation state, the units process the input frequency to an output frequency
according to the selected operational parameters and settings. Each of the front keys provides the
command functions as attached to it upon setup in the "Command Menu"
5.2. Keypad Interlock
There is a 3-stage conception to protect the keys against unauthorized changes of the configuration
respectively against activation of commands.
Stage Protected Range
Protection
by
Key Operations
Change of Parameters
Commands
1
---
---
permitted
permitted
2
Menu
Password upon
activation of menu
Protection of selectable parts of the menu
via password
permitted
3
Keyboard
Hardware-Latch 1
interlocked
permitted
Hardware Latch 2
All functions interlocked
The "Key Pad" menu allows to define an individual password for each group of parameters. This
function can be used to provide individual access rights to different operators. Upon access to an
interlocked section the unit asks for the corresponding password. If the correct password is not
entered in time, the unit denies access and automatically returns to normal operation.
The hardware latch function can be activated and deactivated by one of the Control Inputs, or by
means of serial access to the corresponding locking register.
Using the Hardware Latch function may accidentally cause a total locking of all
functions, when the Control Inputs characteristics have been set inauspiciously.
In this exceptional case you can release the key functions again by either
a) applying the correct logical state (High or Low) to the inputs
b) or resetting the parameters to their default values (see section 5.6.)
c) or change the parameters being responsible for the locking by PC
P
