ABB STT04 - Analog Point-To-Point Communications Wiring; ABB Digital Field Bus and HART Wiring

DESCRIPTION AND OPERATION
PHYSICAL OPERATION
2 - 2
Figure 2-1. Analog Point-to-Point Communications Wiring
Figure 2-2. ABB Digital Field Bus and HART Wiring
T01323B
STT
+–
–
–
+
+
COMMUNICATIONS ARE
NOT POSSIBLE ON THIS
SIDE OF 250- RESISTOR
Ω
COMMUNICATIONS ARE
POSSIBLE ON THIS SIDE
OF 250- RESISTOR
Ω
SIGNAL WIRES
FIELD DEVICE
UP TO 1 MI. (1.6 KM)
SYSTEM POWER
SUPPLY
PWR/
OUTPUT
CONTROLLER,
RECORDER OR
CONTROL SYSTEM
250 Ω
T01324B
STT
SIGNAL WIRES
TERMINATION
UNIT
FIELD BUS
I/O MODULE
MFP/MFC
–
–
+
+
FIELD DEVICE 1
FIELD DEVICE 8
PWR/
OUTPUT
PWR/
OUTPUT