Back to top

4-channel digital input terminal, Safety

The AKT2G-SDI-004 is a digital input terminal with 4 fail-safe inputs. With two-channel connection, the this meets the requirements of IEC 61508:2010 SIL 3,DIN EN ISO 13849-1:2015 (Cat 4, PL e), UL508, UL1998 and UL991.

Product available worldwide
4-channel digital input terminal, Safety


Please refer to the KAS webhelp for important information regarding the application and use of safety rated I/O terminals.

Technical Data AKT2G-SDI-004
Number of inputs 4
Status Display

4 (one green LED per input)

Reaction time (read input/write to E-bus)

typically: 4 ms,

maximum: see error reaction time

Error reaction time

≤ watchdog time

Cable length between sensor and terminal

unshielded max. 100 m (0.75 or 1 mm²) shielded max. 100 m (0.75 or 1 mm²)

Output current of the clock outputs

typically 10 mA, max. 15 mA

Input process image

6 bytes

Output process image

6 bytes

AKT2G-SDI-004 supply voltage (PELV)

24 VDC (–15% / +20%)

Signal voltage "0" inputs

-3 V to 5 V (EN 61131-2, type 3) see section Characteristic curve of the inputs

Signal voltage "1" inputs

11 V to 30 V (EN 61131-2, type 3) see section Characteristic curve of the inputs

Current consumption of the modular electronics at 24 V (without current consumption of sensors)

4 channels occupied: typically 12 mA

0 channels occupied: typically 1.4 mA

Current consumption via E-bus

4 channels occupied: approx. 200 mA

Power dissipation of the terminal

typically 1 W

Electrical isolation (between the channels)


Electrical isolation (between the channels and the E-bus)


Insulation voltage (between the channels and the E-bus, under common operating conditions)

insulation tested with 500 VDC

Dimensions (W x H x D)

12mm x 100mm x 68mm


approx. 50 g

Permissible ambient temperature (operation) up to SW 05

0 °C to +55 °C (see note in Installation position and minimum distances)

Permissible ambient temperature (operation) from SW 06 (week 02/2014)

-25°C to +55 °C (see note in Installation position and minimum distances)

Permissible ambient temperature (transport/storage)

-40°C to +70°C

Permissible air humidity

5% to 95%, non-condensing

Permissible air pressure (operation/storage/transport)

750 hPa to 1100 hPa

(this corresponds to a height of approx. -690 m to 2450 m over sea level assuming an international standard atmosphere)

Climate category according to EN 60721-3-3


(the deviation from 3K3 is possible only with optimal environmental conditions and also applies only to the technical data which are specified differently in this documentation)

Permissible level of contamination according to EN 60664-1

level of contamination 2

(comply with the section Safety I/O Maintenance)

Impermissible operating conditions

Safety terminals must not be used under the following operating conditions:

•   under the influence of ionizing radiation (that exceeds the level of the natural environmental radiation)

•   in corrosive environments

•   in an environment that leads to unacceptable soiling of the Bus Terminal

EMC immunity/emission

conforms to EN 61000-6-2 / EN 61000-6-4

Vibration/shock resistance

conforms to EN 60068-2-6 / EN 60068-2-27


15 g with pulse duration 11 ms in all three axes

Protection class


Permitted operating environment

In the control cabinet or terminal box, with minimum protection class IP54 according to IEC 60529

Permissible installation position

see section Installation position and minimum distances


CE, cULus

Get Started

Count on Kollmorgen support to help you design and build a successful machine and keep it reliably productive, anywhere in the world. Our co-engineering experts will work with you to tailor a perfect-fit solution for your motion requirements.

Talk to a motion expert
Title Language(s) Date Size
pdfAKT2G I/O Manual EN (REV C) English 07 Dec 2021 11.67 MB Copy URL
KAS v3.07 is now available!! New Features Modular EtherCAT Topology Module Maintenance and Reuse Multiple Machine Variants Single KAS project file ECATDeviceAction(...) to disconnect/connect devices while...
KAS Safety System with SCU Safety Controller This application note details creating and running a KAS Safety application with: PCMM Machine/Motion Controller SafePLC2 Safety Controller AKD2G Servo Drive with FS3 safety card...
KAS Stepper Control with AKT2G slices AKT2G-SM-L50-000 and AKT2G-SM-L15-000 EtherCAT stepper drives allow you to control Stepper motors up to 5 Amp (6.5 with fan cartridge AKT2G-AC-FAN-001) with a PDMM or PCMM controller. The same...
KAS v3.06 is now available!! New Features Kollmorgen E-Bus Stepper Integration: AKT2G-SM-L50-000 - Stepper motor terminal with incremental encoder, 50 V DC, 5 A (Imax), 2 phases AKT2G-SM-L15-000 - Stepper motor...
Coupler Sizing - AKT2G Remote IO     Introduction The AKD-PDMM controller/drive, PCMM standalone controller, AKD, AKD2G, and S700 drives all contain hardware I/O that can be used in an application to...
Title Language(s) Date Size
pdfAKT2G-SDI-004-000 TUV Certification English 17 Dec 2020 485.79 KB Copy URL
pdfAKT2G-SDO-004-000 TUV Certification English 17 Dec 2020 486.05 KB Copy URL
pdfKollmorgen EU Declaration of Conformity AKT2G German 18 Dec 2020 102.64 KB Copy URL
pdfKollmorgen EU Declaration of Conformity AKT2G English 18 Dec 2020 102.52 KB Copy URL