9. Locking function keys via the PLC
9. Locking function keys via the PLC
Each of the terminal's keys may be locked by the PLC (except dynamic function keys of XBT-PM). The dialog table (see
chapter C ) is used for
dialog between the PLC and the terminal. In this table, words are reserved for locking the various function keys in the form of a word bit : bit at 1= key locked.
Function keys
%MWn-22
Bit 15
F16
Bit 0
F1
Bit 7
F24
Bit 0
F17 %MWn+23
Other keys:
B
%MWn+24
Bit 0: Up arrow
Bit 1: Down arrow
Bit 2: Right arrow
Bit 3: Left arrow
Bit 4: MOD
Bit 5: PRINT
Bit 6: MENU
Bit 7: SYST
Bit 8: ALARM
Bit 9: EXIT
Bit 10: HOME
Bit 11: +1
Bit 12: -1
Bit 13: ENTER
%MWn+25
Bit 0: 0
Bit 1: 1
Bit 2: 2
Bit 3: 3
Bit 4: 4
Bit 5: 5
Bit 6: 6
Bit 7: 7
Bit 8: 8
Bit 9: 9
Bit 10: .
Bit 11: +/-Bit
Bit 12: DEL
Magelis
Magelis
XBT-H, XBT-HM XBT-P XBT-PM XBT-E
B - 37
9. Locking function keys via the PLC
Ex.
PLC
Lock F1
TERMINAL
Press F1 : no action
Dialog table
W21,0
1
W21,0
Magelis
WARNING
UNINTENTIONAL EQUIPMENT OPERATION
Pressing the MENU key allows the inexperienced or untrained operator to accidentally display the wrong page, modify the terminal configuration or lose the messages and alarms on the screen. This can lead to confusion, panicking, and, as a consequence, to loss of control over the machine. It is strongly recommended that the PLC be programmed to lock the MENU key as well as the other currently unused keys in order to prevent this from happening.
Failure to follow this instruction can result in death, serious injury, or equipment damage.
The terminal reads the PLC dialog table and locks those keys whose word bit is at 1. It is not necessary to write a program in the PLC to control the communication.
The dynamic function keys (XBT-PM) cannot be locked.
XBT-H, XBT-HM XBT-P XBT-PM XBT-E
B - 38 Magelis
