Yokogawa digitalYEWFLO (DY) - Manual (Page 31)

QUICK START USING THE BT100/200
IM 1F2B4-01-YIA
Page 35
Single Digital Process Variable Rate:
Poll/Response Mode: 2.0 per second
Burst Mode: 3.7 per second
Maximum Number of Multi-drop Devices:
Loop Powered: 15
Multivariable Specification:
Maximum process variable per smart device: 256
Maximum Number of Communication Masters: Two
2.3.2 Hardware Recommendations:
Supply Voltage: 17-42 VDC
Load Resistance: 250 to 600 ohms (includes cable resistance)
Refer to Figure 1.3.2 on page 7 for power
supply voltage requirements and load
resistance.
Minimum cable size: 24 AWG, (0.51 mm diameter)
Cable Type: Single pair shielded or multiple pair with
overall shield
Maximum Twisted-Pair Length: 10,000 ft. (3,048 m)
Maximum Multiple Twisted-Pair Length: 5,000 ft (1,524 m)
Use the following formula to determine cable length for a specific application:
L = 65 x 106 - (Cr + 10,000)
(R x C)
C
where:
L = length in feet or meters
R = resistance in ohms (current sense resistance plus barrier resistance)
C = cable capacitance in pF/ft or pF/m
Cf = maximum shunt capacitance of field device in pF