1. Product Overview

The URAX-E1 provides an interface between a compatible
two-hand control device and an AS-i safety system.
Two-hand controls are commonly used in machinery
applications where an operator must activate two
separate controls to initiate a defined machine
operation. The arrangement is intended to help keep
the operator’s hands away from a hazardous area
during the relevant part of the machine cycle.

The URAX-E1 is specifically intended for two-hand
control devices conforming to EN 574 Type IIIC,
as described in ABB documentation. Its input
monitoring evaluates the signals associated with
both hands rather than treating the controls as
ordinary independent command inputs. The module
therefore serves a different purpose from a
standard digital input device.

The unit communicates through an AS-i bus connection.
Its role within the complete safety function depends
on the connected devices, the AS-i safety monitor
or controller, and the validated machine safety
design. Correct integration requires the applicable
ABB instructions and the safety requirements of
the machine.

2. Product Identification and Technical Specifications

The following information summarizes identification
and technical data published for the URAX-E1. Values
should be checked against the documentation applicable
to the installed device and its system configuration.

These values describe the URAX-E1 documentation.
The complete installation must also satisfy the
requirements of the connected two-hand control
device, AS-i network, safety controller, and
machine-specific risk assessment.

3. Two-Hand Control Input Monitoring

The URAX-E1 is designed to monitor two-hand control
inputs. ABB documentation describes two inputs for
each hand: one associated with a normally open
contact and one associated with a normally closed
contact. The device evaluates all four input signals
according to its defined safety logic.

For a valid activation, all four inputs must be
activated within 0.5 seconds. This timing requirement
helps establish that both hands operate the controls
within the specified interval. The exact contact
states and wiring must follow the URAX-E1 connection
diagram and the instructions for the connected
two-hand control device.

The input channels are monitored. If the URAX-E1
becomes deactivated, all four inputs must return to
their inactive states before a new activation is
possible. This reset condition is part of the
device’s operating logic and should be considered
when commissioning and troubleshooting the system.

The module should not be treated as a substitute
for a complete machine safety assessment. The
protective function depends on the design and
validation of the entire safety-related control
system, including mechanical guarding, control
devices, logic components, and final switching
elements.

4. AS-i Bus Interface

AS-Interface is a fieldbus technology used to connect
sensors and actuators with a control system. In a
safety-related installation, compatible safety
devices communicate through the designated AS-i
safety architecture. The URAX-E1 acts as a safe
input slave for connecting supported two-hand
control devices to that architecture.

ABB documentation specifies an AS-i supply through
the yellow AS-i cable, with a nominal voltage of
30 V DC and a documented range of 26.5–31.6 V DC.
The total AS-i current consumption is specified
as less than 150 mA. Network design must account
for the complete bus load, cable arrangement,
addressing, and the requirements of the associated
AS-i equipment.

The module’s role is limited to its defined interface
and monitoring functions. Before integration, confirm
that the connected safety monitor or controller
supports the intended configuration and that the
complete system is configured and validated in
accordance with its technical documentation.

5. Output and Response Characteristics

ABB’s safety handbook lists a non-safe auxiliary
output of 24 V DC, with a specified current value
of 700 mA. Because this is identified as a
non-safe output, it must not be assumed to provide
a safety-rated switching function. Its use should
follow the manufacturer’s wiring instructions and
the requirements of the connected load.

The documented response time for switching off
is 12 ms for the URAX-E1 itself, excluding sensors
and other peripheral components. This figure
describes the module’s contribution rather than
the total response time of a complete machine
safety function.

A complete response-time calculation must include
the connected input devices, the safety logic,
communication-related effects where applicable,
output switching components, and other elements
in the safety chain. The machine designer must
verify that the overall response time is suitable
for the required protective distance and application.

6. Enclosure and Environmental Conditions

The URAX-E1 is specified with an IP67 enclosure
rating. This rating indicates protection against
dust ingress and temporary immersion under the
standardized test conditions. It does not remove
the need to follow the installation requirements
for connectors, cable entries, seals, and mounting.

The documented ambient operating temperature
range is -25°C to +65°C. The installation should
remain within the specified environmental limits,
taking account of the actual enclosure arrangement
and the conditions at the mounting location.

The housing is described as yellow and black.
Before installation, inspect the enclosure and
connector interfaces for visible damage and verify
that the mounting arrangement is appropriate for
the application. Any additional environmental
restrictions should be checked in the current
product documentation.

7. Safety Standards and System Design

ABB safety documentation associates the URAX-E1
with two-hand control applications according to
EN 574 Type IIIC. The handbook also lists safety
performance information, including SIL 3 under
specified functional safety standards and
Performance Level e, Category 4 under
EN ISO 13849-1.

These ratings must be interpreted within the
manufacturer’s stated conditions and the design
of the complete safety-related control system.
They do not mean that installing the URAX-E1
alone automatically makes a machine compliant
or establishes a particular performance level
for the whole installation.

A qualified machine safety engineer should
evaluate the risk, select appropriate components,
establish the required safety function, and
validate the complete implementation. Applicable
standards and regulatory requirements should be
checked for the machine’s location and intended use.

8. Installation and Commissioning

Before commissioning, verify the order code
2TLA020072R0600 and the URAX-E1 type designation.
Check the wiring diagram, terminal assignments,
supply requirements, connected two-hand control
device, and AS-i network configuration. Do not
rely solely on visual similarity when identifying
replacement components.

Test the two-hand activation sequence according
to the manufacturer’s instructions. Confirm that
the required input transitions occur within the
specified time interval and that the module does
not permit a new activation until the required
input reset condition has been met. Additional
tests should verify the complete machine safety
function, not only the module’s local behaviour.

Installation, testing, and fault diagnosis must
be performed by suitably qualified personnel
using the approved procedures for the machine.
Bypassing safety inputs or defeating protective
functions is not an acceptable troubleshooting
method.

9. Replacement and Compatibility Verification

When replacing a URAX-E1, compare the complete
order code and product type with the existing
component. Confirm the required two-hand control
interface, AS-i compatibility, supply conditions,
enclosure requirements, and system configuration.

Other URAX variants have different input
arrangements or are intended for different types
of safety devices. A similar appearance or shared
product family does not establish interchangeability.
The replacement must match the intended application
and the validated safety design.

After replacement, update equipment records and
perform the tests required by the applicable
safety documentation. If the wiring, addressing,
or safety configuration changes, verify and
document the resulting system configuration
before returning the machine to service.

10. Product Summary

The ABB URAX-E1, order code 2TLA020072R0600,
is a safe input slave for AS-i bus systems
designed for two-hand control devices according
to EN 574 Type IIIC. Documented characteristics
include 30 V DC nominal AS-i supply, IP67
enclosure protection, monitored four-input
operation, and a 12 ms module switch-off response
time excluding connected sensors and peripherals.

Correct selection and use require confirmation
of the product designation, wiring, connected
devices, AS-i architecture, and complete machine
safety requirements. Refer to the applicable
ABB URAX-E1 manual and safety documentation
for detailed connection instructions and
commissioning procedures.