Beckhoff EL2904 User Manual

Table of contents
EL2904 3Version: 3.2.2
Table of contents
1 Notes on the documentation....................................................................................................................5
1.1 Disclaimer..........................................................................................................................................5
1.1.1 Trademarks........................................................................................................................5
1.1.2 Patents...............................................................................................................................5
1.1.3 Limitation of liability............................................................................................................6
1.1.4 Copyright............................................................................................................................6
1.2 Version numbers of the documentation ............................................................................................7
1.3 Staff qualification...............................................................................................................................8
1.4 Safety and instruction........................................................................................................................9
1.5 Beckhoff Support and Service.........................................................................................................10
2 For your safety ........................................................................................................................................11
2.1 Duty of care.....................................................................................................................................11
2.2 Safety image signs..........................................................................................................................12
2.3 General safety instructions..............................................................................................................13
2.3.1 Before operation...............................................................................................................13
2.3.2 During operation...............................................................................................................13
2.3.3 After operation..................................................................................................................13
3 System description .................................................................................................................................14
3.1 The Beckhoff Bus Terminal system ................................................................................................14
3.1.1 Bus Coupler .....................................................................................................................15
3.1.2 Bus Terminals ..................................................................................................................16
3.1.3 E-bus................................................................................................................................16
3.1.4 Power contacts.................................................................................................................16
3.2 TwinSAFE .......................................................................................................................................16
3.2.1 The I/O construction kit is extended safely ......................................................................16
3.2.2 Safety concept .................................................................................................................17
3.2.3 EL1904, EL2904 - Bus Terminals with 4 fail-safe inputs or outputs.................................18
3.2.4 EL6900 - TwinSAFE logic terminal ..................................................................................18
3.2.5 The fail-safe principle (Fail Stop) .....................................................................................18
4 Product description ................................................................................................................................19
4.1 EL2904 – TwinSAFE terminal with 4 digital fail-safe outputs..........................................................19
4.2 Intended use ...................................................................................................................................20
4.3 Technical data.................................................................................................................................22
4.4 Target failure measures ..................................................................................................................23
4.5 Dimensions .....................................................................................................................................24
4.6 Block diagram of the EL2904 ..........................................................................................................25
5 Operation .................................................................................................................................................26
5.1 Environmental conditions ................................................................................................................26
5.2 Installation .......................................................................................................................................26
5.2.1 Safety instructions............................................................................................................26
5.2.2 Transport / storage...........................................................................................................26
5.2.3 Electrical installation.........................................................................................................26
5.2.4 Mechanical installation.....................................................................................................31

Beckhoff EL2904 Specifications

General

Brand	Beckhoff
Model	EL2904
Category	Touch terminals
Language	English