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SI-I/O User Guide
Issue Number: 3
3.4
Digital I/O
By default, the SI-I/O Module is set up for four programmable digital inputs/outputs. By configuring the analog I/O as digital inputs, it is possible for the
SI-I/O module to have four programmable inputs/outputs and also four digital inputs.
The functionality of these terminals is as follows:
•
The logic sense selected can be positive or negative
•
The logic state of each input is monitored by a read-only parameter
•
The logic state can be inverted
•
The digital input can be programmed to any suitable destination bit parameter
•
The digital output can be sourced from any suitable bit parameter
•
The output can operate either as a push-pull or an open collector output
3.5
Analog I/O
By default, the SI-I/O is set up for three single-ended analog inputs and one analog output or one high resolution differential analog input, one single-
ended analog input and one analog output.
Analog inputs 1 and 2 can only be configured as ±10 Vdc voltage inputs or digital inputs. When both are configured as analog voltage inputs, they can
be used as a single high resolution differential analog input.
Analog input 3 can operate in voltage mode (±10 Vdc), current mode (0 to 20 mA) or as a digital input.
Analog output 1 can operate in voltage mode (±10 Vdc), current mode (0 to 20 mA) or as a digital input.
The high precision differential analog input and analog output is only supported on Unidrive M600 - M800.
3.6
Relays
The two relays can be used to convey the logic state of any suitable parameter to external equipment. The logic state is processed as follows:
•
A suitable source parameter is assigned to each relay
•
The logic state can be inverted
•
The state of the relay is monitored by a parameter
3.7
24 V internal power supply
If the user load exceeds 400 mA at 24 V, (24 V internal power supply), then an external
24 V power supply will be required which should be connected to the drive’s control terminals 1 and 2.
The user load comprises of:
•
The drive’s digital outputs plus the SI-I/O digital outputs
Or
•
The drive’s main encoder supply
The maximum output current from the drive’s digital output terminals 22, 24, 25 and 26 is 240 mA at 24 V, exceeding this will result in an ‘Output
overload’ digital output overload trip.
The SI-I/O has a maximum output current of 250 mA at 24 V across all four digital outputs.
By default, the digital inputs/outputs on the Option module are configured to operate in positive logic.
Configuration of the maximum of eight digital inputs for positive/negative logic is carried out by setting Pr
S.01.008
.
If the maximum current of the drive and Option modules is exceeded a ‘PSU 24V' 24 V internal power supply overload trip will result.
NOTE
NOTE
NOTE
NOTE
