11.7. Motor Port as Digital I/O

!Motor port as digital I/O is only applicable for an ERSC in PLC I/O Mode

External controller must first set bit 15 = 1 in the Set Left/Right Motor Port Digital Control register for the motor port (Left or Right) that is to be used as digital output. If bit 15 = 0, then the ERSC ignores the bit 0 thru bit 2 commands and will not provide meaningful status on bits 12 and 14 in the corresponding Left/Right Motor Port Digital I/O Status register for the port in question. Bit 0, bit 1, and bit 2 can be independently set and reset by the PLC and all 3 digital outputs can be energized simultaneously.

Motor Phases as Digital Outputs

*Please note that the ERSC switches to GND to complete the circuit

!Short Circuit Error on bit 12 is classified as a “fatal” error that will require either a cycle of power on the ERSC or an explicit Motor Fault Reset command from external controller the same as if the port was being used as a motor port.
External controller must continuously write “1” to the Motor Fault Reset register for at least 500 msec for reset to occur

Using the Brake Output Pin on the Motor Port

You can also utilize the Brake Output (Pin 9 on the JST connector) as a +24V output signal controlled from your PLC program when the ERSC is in PLC I/O mode. This signal sources +24V and is limited to 0.5A load.

*Unlike the motor phases (Pins 3, 4, and 5), the Brake Output is available when the motor port is not in digital mode and is actually running a motor.

When using the Brake Output when the port is actually running a motor, you must set bit 7 in the appropriate left or right “Set Motor Port Digital Control” output word in order to enable the Brake Output functionality. Once you do this, then bit 6 in the same word controls the on/off state of the digital signal. If you have enabled the motor port for digital control by setting bit 15, you do not have to also set bit 7 to enable the Brake Output. It is already enabled when you set bit 15

Brake Output Pin as Digital Output