
B–62073E–1/04 2. INTERFACE BETWEEN CNC AND PMC–NA OR NB
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2.3 Signals
This section describes the signals used by the Series 15–T, 15–M, and 15–TT. Functions that can be used
depend on machine types. Read the corresponding specifications and check the functions that can be used.
The name of the signal provided for the Series 15–TT is enclosed between brackets ([]).
2.3.1 Ready signals
(a) Control unit ready signal: MA
[Classification]
Output signal
[Function] Informs that the control unit is ready for normal operation.
[Output Condition]
The signal goes high when:
i. Self diagnosis of the control unit normally terminates after the power of the control unit
is turned on.
The signal goes low when:
i. The power of the control unit is turned off.
ii. A CPU error, memory error, or any other error of the control unit is detected.
(b) Servo ready signal: SA
[Classification]
Output signal
[Function] Informs that the servo system is ready for normal operation. This signal is not output while
the servo system [position control) is not working.
[Output Condition]
The signal goes high when:
i. Diagnosis of the servo system normally terminates after the power of the control unit is
turned on.
ii. A servo alarm is released by the reset function.
iii. The emergency stop state is released.
The signal goes low when:
i. The power of the control unit is turned off.
ii. A servo alarm is detected.
iii. The system is placed in the emergency stop state.
iv. A CPU error, memory error, or any other error of the control unit is detected.
[Use] The signal determines whether the machine applies brakes to required axes. When this sig-
nal is high, the machine releases the brake. When this signal is low, the machine puts on the
brake.
NOTE The servo–off state is one of states in which the servo system, or position control does not
function. In the servo–off state, the SA signal remains high unless an event causes the signal
to go low.
(c) Servo ready signal: HEMG
[Classification]
Output signal
[Function] Same as the SA signal
[Output Condition]
Same as the SA signal. This signal, however, changes its state up to 16 ms faster than the
SA signal.