Siemens S5-155U System Manual page 526

Index
E
Electrical connection with process I/Os......................................................................................................3-25
Electromagnetic compatibility ......................................................................................................................3-4
EMC measures
specific.............................................................................................................................................3-19
EMC, basic rules ...........................................................................................................................................3-7
Enable circuit
digital input/output modules..............................................................................................................8-6
Enable input ................................................................................................................... 9-7, 9-38, 9-54, 9-104
switching off................................................................................................................................. 9-104
Enable inputs
functioning.........................................................................................................................................8-8
Enable switching off ..................................................................................................................9-7, 9-38, 9-54
Enable time........................................................................................................................................ 6-18, 6-21
Equipotential bonding conductor...................................................................................................... 3-16, 9-19
Example of an electrical installation...........................................................................................................3-25
F
Fan ...........................................................................................................................................................4-5
failure...............................................................................................................................................4-53
Fan
removing..........................................................................................................................................4-36
replacing ................................................................................................................................ 4-45, 4-79
Fan lock, releasing ......................................................................................................................................4-36
Fault indications
load power supply............................................................................................................................4-66
power supply units...........................................................................................................................4-39
PSU 6ES5 955-3NA12....................................................................................................................4-77
Fault register................................................................................................................................................6-29
FB 40 function block ........................................................................................................................ 9-11, 9-58
Filter mat
replacing ..........................................................................................................................................4-49
Filter subdrawer
fitting................................................................................................................................................4-37
Floating modules.........................................................................................................................................3-29
Four-wire circuit........................................................................................................................................9-115
Front connector ................................................................................................................................. 4-11, 6-21
463 analog input module .................................................................................................................9-51
466 analog input module .............................................................................................................. 9-101
Front plate ...................................................................................................................................................6-21
CPU 922 ..........................................................................................................................................5-46
CPU 928 ..........................................................................................................................................5-36
CPU 928B........................................................................................................................................5-26
CPU 948 ..........................................................................................................................................5-10
power supply units...........................................................................................................................4-24
PSU 6ES5 955-3NA12....................................................................................................................4-70
Front plate width ............................................................................................................................... 6-17, 6-21
Front strip
24 V/4 A load power supply............................................................................................................4-64
Full duplex operation
RS422-A/485 submodule ................................................................................................................5-85
12 - 6
System Manual
C79000-S8576-C199-03