8.15.2 Digital inputs (X3/X4)
All digital inputs are electrically isolated via optocouplers.
Technical characteristics
— Ground reference is Digital-GND (DGND, terminals X4/3 and X4/4)
— The inputs at X3 are PLC-compatible (IEC 61131-2 Type 1)
High: 11...30 V / 2...11 mA , Low: -3...5V/<1mA
— Update rate Software:250 µs / Hardware: 2 µs
ENABLE input
The output stage of the servo amplifier is enabled by applying the ENABLE signal
(terminal X3/12, 24 V input, active high). Enable is possible only if input STO-Enable has
a 24 V signal (see page 37ff).
In the disabled state (low signal) the connected motor has no torque.
STO-ENABLE input
An additional digital input (STO-Enable) releases the power output stage of the amplifier
as long as a 24 V signal is applied to this input. If the STO-Enable input goes open-circuit,
then power will no longer be supplied to the motor, the drive will lose all torque and
coast down to a stop. A fail-safe brake function for the drive, if one is required, must be
ensured through a mechanical brake since electrical braking with the aid of the drive is no
longer possible.
You can thus achieve a restart lock-out for functional safety by using the STO-Enable
input in conjunction with an external safety circuit.
You can find further information and connection examples on page 37.
The STO-Enable input is not compatible with IEC 61131-2.
Programmable digital inputs
You can use the DIGITAL-IN1 to DIGITAL-IN4 digital inputs to initiate pre-programmed
functions that are stored in the servo amplifier. A list of these pre-programmed functions
can be found on the “Digital I/O” screen page of our setup software.
If an input was freshly assigned to a pre-programmed function, then the data set must be
saved in the EEPROM of the servo amplifier and a reset has to be carried out (with the
amplifier setup software for example).
S300 Instructions Manual 93
Kollmorgen 02/2017 Electrical installation
DIGITAL-IN2
DIGITAL-IN1
11
12
3
DGND
ENABLE
DIGITAL-IN4
8
9
10
DIGITAL-IN3
X3
NSTOP
ENABLE
I/O-GND
PSTOP
STO-ENABLE
5
4
X4
+24V against CNC-GND
Controls
S300
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