1 Preliminary note Technical data, approvals, accessories and further information at www�ifm�com� 1.1 Explanation of symbols ► Instructions > Reaction, result → Cross-reference Important note Non-compliance may result in malfunction or interference� Information Supplementary note� WARNING Warning of serious personal injury�...
4 Functions and features AS-Interface safety switches type AC903S/AC904S operate as slaves on the safety bus AS-Interface Safety at Work and function as electromagnetic interlock devices with guard locking� The actuator has a low coding level�...
5 Structure and operating principle AS-Interface safety switches, type AC903S/AC904S feature a slave interface to the safety bus AS-Interface Safety at Work� They enable locking of movable safety guards�...
AS-Interface safety monitor and the data bit table)� 5.1 Actuator version Actuator S for the AS-i safety switches AC903S/AC904S without insertion funnel� 5.2 Version AC903S (guard locking by spring force) The locking bolt is held in locked position by spring force and is electromagnetically released�...
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> The locking bolt is released� > The door monitoring contact closes� - AC903S: The locking bolt passes into the locked position by spring force� - AC904S: The locking bolt passes into the locked position by applying the operating voltage of the solenoid�...
AC904S ► Switch off the operating voltage of the solenoid and release the guard locking via the AS-Interface output bit D0� > The guard locking is deactivated, the solenoid monitoring contact ÜK opens� The value pair 0, 0 is transmitted in every bus cycle via the AS-Interface input bits D2 and D3�...
► Mount the safety switch positively� ► Permanently connect the actuator to the safety guard so that it cannot be detached (e�g� using the enclosed non-removable screws), alternatively rivet or weld� ► Fit an additional end stop for the movable part of the safety guard� Observe EN ISO 14119:2013, sections 5�2 and 5�3, on mounting of a safety switch and an actuator�...
6.2 Protection against environmental influences A lasting and correct safety function requires that the actuating head must be protected against the penetration of foreign bodies such as swarf, sand, blasting shot etc� ► Cover the actuating slot, the actuator and the type label during paint work� 7 Electrical connection ►...
8.2 Configuration in the AS-Interface safety monitor Refer to the operating instructions of the AS-Interface safety monitor and the data bit table� Configure the safety switch in the AS-Interface safety monitor with the set AS-Interface address, for example, as follows: Dual-channel dependent - synchronisation time = infinite (∞) In this operating mode, the safety guard must be opened each time prior to...
9 Operation 9.1 LED indicators / AS-Interface status messages Status Device status LED 3 Fault LED 4 Power green is lit normal operation red and green are lit No data exchange between master and slave� Possible causes: - master in the STOP mode - slave not in LAS - slave with wrong IO ID - reset active at slave...
10 Function check and troubleshooting WARNING Errors during installation and function check can lead to fatal injury� ► Before the function check ensure that there are no persons in the hazardous area� ► Adhere to the applicable accident prevention regulations� ►...
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Maintenance is not necessary� To ensure a trouble-free long-term operation regular inspections are necessary� ► Check the unit for the following points: - correct switching function - secure mounting of the components - dirt and wear - loose connectors Exclusion of liability under the following circumstances: - if the unit is not used for its intended purpose - non-compliance with the safety regulations - installation and electrical connection by non-authorised personnel...
12 Technical data AC903S, AC904S Safety switch with guard locking The unit can be used in applications to PL d according to EN ISO 13849-1: 2016� Mechanical data Housing material reinforced glass-fibre thermoplastic Degree of protection to IEC 529 IP 67, mating connector plugged in...
Solenoid monitoring contact ÜK D2, D3 AS-Interface outputs interlocking solenoid, 1 = solenoid energised LED red, 1 = LED on LED green, 1 = LED on AS-Interface LED Power green, AS-Interface voltage applied AS-Interface LED Fault red, offline phase or address "0" Reliability values to EN ISO 13849-1 5 x 10 13 Terms and abbreviations...
14 Data bit table 1: Protective equipment closed and locked 2: Protective equipment closed but not locked 3: Protective equipment open Programming Status D0, D1 D2, D3 Monitor diagnostics dual-channel protective equipment code sequence green conditionally closed and locked dependent protective equipment half- yellow, flashing...
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Programming Status D0, D1 D2, D3 Monitor diagnostics dual-channel protective equipment code sequence green independent closed and locked protective equipment half- closed but not locked sequence invalid state half- (protective equipment sequence open, guard locking active) protective equipment open address 0 or —...
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Programming Status D0, D1 D2, D3 Monitor diagnostics dual-channel protective equipment code sequence Green, if the dependent closed and locked protective synchronisation equipment has time infinite ∞ been open before or yellow, flashing, after start-up, if only the guard locking has been open�...
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15 Standards and approvals 15.1 Directives and standards The following standards and directives have been applied: - Machinery Directive 2006/42/EC - EN ISO 13849-1: 2016 - EN 62026-2: 2013 - EN 60947-5-1: 2004/: 2009 - EN 60947-5-1: 2004/: 2009 - Annex K - EN 14119: 2013 15.2 Approvals - EU declaration of conformity...