4, 8 unipolar stepper motor drives, 40V, 3A


EtherCAT ® 4 & 8 Axis Stepper
Drive Module

  • Economical Four-Axis and Eight axes Stepper Drives Module with
    EtherCAT Network interface
  • Up to 40Vdc, 3A per motor
  • Optional built-in 40Vdc, 240W AC/DC power supply
  • 8-Axis module
    7 Unipolar drives and one Bipolar drive
  • 4-Axis module
    3 Unipolar drives and one Bipolar drive
  • Open loop operation
  • Programmable current level per axis: 1A, 1.5A, 2A, 3A
  • Programmable microstep size per axis: Full, 1/2 , 1/4, 1/8, 1/16
  • Two sets of P/D inputs and P/D outputs for Master/Slave operation
  • General purpose I/O: 6 inputs 6 outputs
  • Compact size

The SDMNT line of multi-axis open loop step motor drives modules are specifically designed to address
the needs for economical solutions for machines with many open loop step motors operating as part
of an EtherCAT network. It is fully supported by any of ACS’ EtherCAT master controllers, such as the
SPiiPlusNT, SPiiPlusNTM and SPiiPlusSC soft Controller.

The SDMNT is available in 4 and 8 axis versions, with or without built-in supply.
Each unit includes one bipolar drive with up to 40Vdc, 3A. All other drives are unipolar with up to
40Vdc, 3A. The current level is individually programmable for each drive and can be set to the following
levels: 1A, 1.5A, 2A and 3A. The step resolution is individually programmable for each drive and can
be set to the following levels: full step, 1/2, 1/4, 1/8 and 1/16 step.

The SDMNTt includes two sets of Pulse/Dir inputs and two sets of Pulse/Dir outputs for Master-Slave
operation. There are 6 general purpose inputs and 6 general purpose outputs. Modules with 40Vdc,
240W built-in motor supply are fed by 95Vac to 240Vac. The 40Vdc is also available as an output
to power additiona units Modules without built-in motor supply are fed by a 12Vdc to 40Vdc input.
Each version is also fed with a 24Vdc control and logic supply that should not be removed during
emergency conditions.


Power Supplies

The module must be supplied by two power sources.

A motor supply and a 24Vdc control supply.
During emergency conditions there is no need to remove the control 24Vdc source. Modules with built-in motor supply are fed by 95Vac - 240Vac and generate 40Vdc bus voltage.The internal generated DC voltage is available through a dedicated output connector. Modules without built-in supply are fed by 12Vdc to 36Vdc.

Cooling Fan

The model can simultaneously drive all axes at a current level of 1A.
When operating with an optional cooling fan, part number FA-1608K-100/LF, the model can drive three axes at a current level of 3A.


Control supply

Range: 24Vdc ±10%
Maximum input power: 10W
Input current: 0.45A @ 21.6V


Motor Type

Two phase step motor



None, open loop operation


Digital Inputs

A total of 6 inputs.
Two isolated inputs. 24Vdc (±20%), floating cathode and anode (two pins).
Four RS422 inputs.


Digital Outputs

A total of 6 outputs.
Two isolated outputs. 24Vdc (±20%) Opto-isolated, floating cathode and anode (two pins).
50mA per output and 100mA for the two outputs.
Maximum voltage drop < 1.7V
Four RS422 outputs.


Pulse Direction Interface

Inputs: two pairs. RS422. The input counter can be read by the Master controller.
Outputs: two pairs. RS422. Programmable to follow the Pulse/Dir generated for any of the internal drives.


Drive Protection

  • Short circuit
  • Over temperature
  • Over voltage
  • Under voltage



290 x 130 x 90 mm (L x W x H, including mounting brackets)



Operating range: 0 to + 40°C

Storage and transportation range: -25 to +60°C
Humidity (operating range): 5% to 90% non-condensing



Two EtherCAT ports, In and Out, RJ45 connector





Part Number
X represents the number of axes
and XX represents special options
(No supply)
(Built-in 240W motor supply)
Number of axes 4 or 8
Input voltage 12Vdc-40Vdc 95Vac - 240Vac (±10%)
Phase current [A] Programmable 1A, 1.5A, 2A, 3A
Max. input current @ input voltage 10.5A @ 40Vdc 4A @ 95Vac
Drive type 1 bipolar, 7 or 3 unipolar
Max. output power [W] 420 240
Microstep size Programmable Full,1/2, 1/4, 1/8*, 1/16 of a step
Heat dissipation at full cont. power [W] 50 34
Weight [gram] 1000 1700
Standards CE (Safety, EMC, RoHS)

* Only for unipolar drive type

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