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CHAPTER 8: SOI-120 FUNCTION KEY BUILDER
Bit Write Mode
Defining the function keys with Bit Write enabled allows each function
key to either set (1) or clear (0) a bit in the PLC. Bit Write may be
enabled with or without Auto Return or Continue Mode screen linking
enabled. The function keys access contiguous registers defined by the
user in SOI-SPS. Example: F1 through F8 are assigned to Register 101
through 108, respectively, so pressing a function key would send the
corresponding integer value to the PLC, depending on whether the
function is to set (1) or clear (0) the bit, per the following.
SOI-120
Function Key
Set Value
Clear Value
Register
Location
F1
00000000 00000001
00000000 00000000
1
F2
00000000 00000010
00000000 00000000
2
F3
00000000 00000100
00000000 00000000
3
F4
00000000 00001000
00000000 00000000
4
F5
00000000 00010000
00000000 00000000
5
F6
00000000 00100000
00000000 00000000
6
F7
00000000 01000000
00000000 00000000
7
F8
00000000 10000000
00000000 00000000
8
All function keys shall be defined with the same bit manipulation such
that all keys either set or clear the assigned bit. It is the responsibility of
the system design engineer to read and reset the bit in the PLC program.
Function key screen link and Bit Write
The F1-F8 Function Keys may perform a “HOT” screen call-up and
perform a Bit Write simultaneously, if programmed to do so. All of the
above capabilities and operation guidelines apply to this combination
functionality.
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