IAI America SCON-C - Manual (Page 85)

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1.3 Details of I/O Signal Functions
An input time constant is provided for the input signals of this controller, in order to prevent malfunction due to
chattering, noise, etc.
Except for certain signals, switching of each input signal will be effected when the signal has been received
continuously for at least 6 msec. For example, when an input is switched from OFF to ON, the controller will only
recognize that the input signal is ON after 6 msec. The same applies to switching of input signals from ON to
OFF (Fig. 1).
Fig. 1 Recognition of Input Signal
1.3.1. Details of Each Input Signal
 Command position number (PC1 to PC256)
When a movement command is effected upon OFF
 ON of the start signal, the nine-bit binary code consisting
of signals PC1 to PC256 will be read as the command position number.
In the standard or teaching type, six bits of PC1 through PC32 are used. In the 256-point type, eight bits of PC1
to PC128 are used. In the 512-point type, nine bits of PC1 through PC256 are used.
The weight of each bit is as follows: 2
0
for PC1, 2
1
for PC2, 2
2
for PC4, …, and 2
8
for PC256. A desired position
number between 0 and 511 (maximum) can be specified.
 Brake forced-release signal (BKRL)
This signal forcibly releases the brake of an actuator equipped with an electromagnetic brake. If this signal turns
ON while the 24-V brake power is supplied to the controller externally and the servo is off, the electromagnetic
brake will be forcibly released.
This signal is disabled when the actuator is not equipped with electromagnetic brake, 24-V brake power is not
supplied externally, servo is on, or brake release switch on the controller is set to the RLS position.
 Operating mode (RMOD)
This signal is used to switch the operating mode of the controller.
Turning OFF this signal will switch the operating mode to “AUTO,” while turning it ON will switch the mode to
“MANU.”
The RMOD signal is enabled when the “AUTO/MANU selector switch” on the front face of the controller is set to
“AUTO.”
For details on the operating modes, refer to 3, “Operation.”
6 [msec] 6 [msec]
Input signal
Recognition by controller
Not recognized Not recognized