Bailey Infi 90 IMFBS01, Instruction

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INTRODUCTION
I-E96-302B C - 1
APPENDIX C - NTFB01 TERMINATION UNIT CONFIGURATION
INTRODUCTION
The FBS module must use the NTFB01 termination unit to ter-
minate FSK digital smart transmitters on a field bus. All
inputs must be in an FSK digital field bus mode when using
the NTFB01 termination unit. There are no other input types
available when operating in this mode.
CONNECTING INPUTS TO THE NTFB01 TERMINATION UNIT
Figure C-1 shows a simplified circuit diagram of the input sig-
nal path through the field bus termination unit. Figure C-2
shows NTFB01 terminal assignments and Figure C-3 shows
module to termination unit cabling.
Figure C-1. NTFB01 I/O Module Input Circuit
33 V
33 V
33 V
20
Ω
2 0
Ω
43
Ω
62 K
Ω
43
Ω
1 µF
1 µF
FSK+
FSK-
TO FBS
MODULE
CURRENT LIMITING
OR
COMMUNICATION
DISCONNECT
CONTROL
CURRENT LIMITING
OR
COMMUNICATION
DISCONNECT
CONTROL
+24 V
+24 V
FB+
FB-
TP36324B