3RK1105-1AE04-2CA0

What type of device is this?

It is an ASIsafe extended safety monitor designed to supervise protective devices connected through an AS-Interface bus system. It provides one enabling circuit with relay outputs for controlling machine shutdown functions.

What applications commonly use this safety monitor?

Typical applications include monitoring emergency-stop buttons, guard switches, protective doors, light curtains, and other AS-Interface Safety at Work devices used in automated machinery and production equipment.

How many enabling circuits does the unit provide?

The unit provides one enabling circuit. This makes it suitable for applications requiring a single monitored release path.

What is the maximum response time?

The safe output relay has a maximum response time of 40 milliseconds, allowing the monitor to respond quickly when a connected protective device changes state.

Which functional safety levels can the monitor achieve?

When correctly integrated into a validated system, the monitor can be used for applications up to Performance Level e and Category 4 under EN ISO 13849-1, and up to SIL 3 under IEC 61508 or EN 62061. The performance of the complete circuit must be assessed for the specific installation.

What supply voltage does the unit require?

The Siemens 3RK1105-1AE04-2CA0 operates from a nominal 24 V DC supply, with an allowable operating range of 0.85 to 1.15 times the rated voltage.

What type of terminals are fitted?

The monitor uses removable screw-type terminals for its inputs and outputs. This arrangement can simplify panel wiring and component replacement.

What are the relay contact ratings?

The rated operational current is 3 A at 250 V AC for AC-12 loads, 3 A at 115 or 230 V AC for AC-15 loads, and 3 A at 24 V DC for DC-12 loads. For DC-13 loads, the ratings are 1 A at 24 V DC, 0.1 A at 115 V DC, and 0.05 A at 230 V DC.

What are the unit's dimensions?

The unit measures approximately 45 mm wide, 108 mm high, and 120 mm deep. These dimensions should be checked against the available control-panel space before installation.

How is the monitor mounted?

It can be mounted on a standard DIN rail or secured using screws, depending on the control-panel arrangement.

What is the operating temperature range?

The specified operating ambient temperature range is -20°C to +60°C. The storage temperature range is -30°C to +70°C.

What does the IP20 rating mean for installation?

An IP20 rating provides protection against contact with larger solid objects but does not provide protection from water. The monitor should therefore be installed inside a suitable electrical enclosure.

Can it communicate over an AS-Interface network?

Yes. The monitor supports the AS-Interface protocol and is intended for AS-Interface Safety at Work networks.

What cable length is permitted for the AS-Interface bus?

The standard maximum AS-Interface bus cable length is 100 meters. Installations exceeding this distance require an appropriately selected AS-Interface repeater.

Does the unit include contactor monitoring and a start input?

Yes. The terminal arrangement includes an EDM input for external contactor monitoring and a start input for the enabling circuit, supporting controlled restart and feedback monitoring arrangements.

What should be checked before replacing an existing monitor?

Confirm the enabling-circuit count, terminal type, 24 V DC supply, AS-Interface network arrangement, relay load ratings, mounting dimensions, and required functional safety performance. The existing wiring and system configuration should also be documented before replacement.