
B-63983EN/02 3.I/O LINK
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Override signals (*OV1 to *OV8) and
program protect key signal (KEY)
For these signals, the relevant key-operated switch contact signals are
directly input to the PMC. Directly process these signals with a PMC
ladder program.
For connection, refer to the section describing the interface between
the CNC and PMC in the CNC connection manual.
Key-operated switch signals (Xn, Xn+2)
Each key-operated switch signal is coded by PMC management
software and input to the relevant PMC address R as a bit image.
Whether a required key is pressed can be determined by checking the
bit image of the key-operated switch using the user PMC ladder
program. (See Tables 3.2.8 (a), 3.2.8 (b), and 3.2.8 (c).) When a key
is pressed, the bit corresponding to the key is 1.
Up to two keys can be input simultaneously. Do not use any keyboard
input method for a user PMC program that requires simultaneous
pressing of three or more keys. If three or more keys are pressed
simultaneously, they are not input correctly.
It takes up to 60 ms until the bit corresponding to a key is set to 1 (0)
after the key is pressed (released).
The address of a key-operated switch signal (Xn to Xn+2: Table 3.2.8
(a)) and the address of its bit image (Rk to Rk+7: Tables 3.2.8 (b) and
(c)) can be defined as the fixed address or an unused address without
restrictions.
LED signals (Ym)
Create each LED signal at PMC address R as a bit image in the user
PMC ladder program. PMC management software converts the bit
image of the LED signal to a coded output signal. (See Tables 3.2.8
(a), (b), and (c).) When a value of 1 is written in an LED bit image,
the corresponding LED is automatically turned on. In the same way,
when a value of 0 is written, the LED is turned off. All LEDs are off
at power-on.
It takes up to 200 ms until an LED is turned on (off) after a value of 1
(0) is written in the corresponding bit image by the PMC.