Rockwell Automation T80004 Application Note Field Loop Configuration - Manual (Page 3)

Trusted
TM
AN-T80004 Field Loop Configuration
Issue 10 Jun 13 AN-T80004 3
Short circuit in field wiring or load (state 5) .................................................................................. 29
Field fault (state 6) ....................................................................................................................... 29
Channel fault (state 7+) ................................................................................................................ 29
No-load (Open Circuit) Threshold .................................................................................................... 30
Triplicated Modules 8448, 8449, 8451, 8461, 8471 ..................................................................... 30
Quad Structure Modules 8472, 8473 ........................................................................................... 31
Termination ...................................................................................................................................... 32
T8842 VFTA ................................................................................................................................. 32
T8850 and T8870 FTAs ............................................................................................................... 33
Power Termination ....................................................................................................................... 34
T8472 Termination ....................................................................................................................... 34
Terminating Resistors .................................................................................................................. 35
Volt-free outputs ........................................................................................................................... 35
Hazardous area outputs ............................................................................................................... 36
Device Characteristics ...................................................................................................................... 36
Low current loads ......................................................................................................................... 36
Dynamic loads.............................................................................................................................. 36
High inrush current loads ............................................................................................................. 37
Power supply fluctuations ............................................................................................................ 37
Analogue Outputs ................................................................................................................................. 38
Module circuit ................................................................................................................................... 38
Line Monitoring ................................................................................................................................. 38
No field supply voltage (state 1) ................................................................................................... 38
Output de-energised (state 2) ...................................................................................................... 38
Open circuit in field wiring or load (state 3) .................................................................................. 38
Output energised (state 4) ........................................................................................................... 39
Current demand cannot be met (state 6) ..................................................................................... 39
Channel fault (state 7) .................................................................................................................. 39
Termination ...................................................................................................................................... 39
Hazardous area outputs ............................................................................................................... 39
Pulse Outputs ....................................................................................................................................... 40
Other Issues ......................................................................................................................................... 43
System Cable Design ....................................................................................................................... 43
Analogue or Digital Input module to FTA ..................................................................................... 43
Analogue or Digital Input module to VFTA ................................................................................... 44
Digital Output module to FTA, Standard Cable ............................................................................ 45
Digital Output module to FTA, integral power cable .................................................................... 46
Digital Output module to VFTA .................................................................................................... 47
Analogue Outputs ........................................................................................................................ 48