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15. PMC CONTROL FUNCTION
1271
NOTE
Read processing is controlled by exclusive--ORing (XOR)
the key code read signal (EKSET) with the read completion
signal (EKENB). When the EKSET and EKENB signals
differ in their logic, the CNC reads the input key code. Once
reading has been completed, the CNC inverts the EKENB
signal to match its logic with that of the EKSET signal.
In the PMC, on the other hand, a new key code cannot be
set while the EKSET and EKENB signals differ in their logic.
[Classification] Input signal
[Function] While this signal is turned on “1”, external key input control is enabled.
In external key input control mode, any MDI key operations are ignored.
[Classification] Input signal
[Function] This signal instructs the CNC to read the input key code.
[Classification] Input signal
[Function] These signals set an input key code. (See the MDI key code table.)
[Classification] Output signal
[Function] While this signal is “1”, no key code is accepted in external key input
control mode.
Signals
External key input mode
selection signal
ENBKY <G066#1>
Key code read signal
EKSET <G066#7>
Key code signals
EKC0 to EKC7 <G098>
Key input disable signal
INHKY<F053#0>