Maple Systems OIT Family - Manual (Page 74)

CHAPTER 6
Key Types
Function Keys
Each OIT has many function keys which can be programmed to display screens or turn
on/off PLC coils. The following modes of operation are available for each function key.
Function Key Mode Operation
Disabled
No operation.
Push On/Off
Emulates on/off switch. Sets assigned PLC coil when pressed; clears
PLC coil when pressed again.
Latched Sets assigned PLC coil when pressed. PLC must clear coil.
Momentary
Emulates momentary switch. Sets assigned PLC coil when pressed;
clears PLC coil when released.
Screen Display
When pressed, displays assigned stored screen unless password
protection is enabled or an alarm screen is currently displayed. If
password protection is enabled, the OIT operator is prompted for a
password and the screen is only displayed if the password is entered
correctly. If an alarm screen is displayed, the function key is ignored.
Passwords
Each function key configured as Screen Display can have one of four password levels
assigned to it. This provides the ability to restrict access to certain messages. Each password
must be four digits long and contain only numbers (the default for each password is 0000).
The four password levels from highest to lowest level of access are Level 1, Level 2, Level
3, and Level 4. Therefore, if a function key is assigned Level 3, the Level 1, Level 2, and
Level 3 passwords all allow the OIT operator to view the screen.
NOTE: Any screens that are displayed by a password-protected function key are not stored in
the screen stack. Therefore, these screens cannot be redisplayed using the LAST
MESSAGE key. This includes screens chained to a password-protected screen.
When a function key is pressed that has been assigned a password level, the OIT operator
is allowed five seconds to enter the four digit password. As the digits are entered,
asterisks appear on the OIT. If the five second time-out occurs before the four digits are
entered, the prior screen is redisplayed. If the OIT operator enters an invalid password, an
error message is displayed for a few seconds and then the prior screen is redisplayed.
To ensure that the password-protected screens are removed from the OIT, it is a good
idea to configure these screens with the timed display feature. For more information on
using timed display, refer to the Timed Display section in CHAPTER 3: Stored Screens.
To configure the Level 1, Level 2, Level 3, and Level 4 passwords:
1. From the Configuration menu, choose General Settings. The OIT General Settings
dialog box appears.
Key Types 74
1010-0099, Rev. 07