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Description of the conditions 2 and 3
■Vm: Supply voltage for the RJ51AW12AL
• Voltage: 21.6 to 27.6VDC (24VDC -10 to +15%), ripple voltage 0.5Vp-p or lower
• Recommended voltage: 26.4VDC (24VDC +10%)
■V(V): Cable-to-cable voltage drop
Calculation formula
V(V) = Transmission cable supply current I(A) Cable resistance R
()
Calculation example
The example shows how to check whether the total wiring length of 100m is sufficient to configure a system in the following
conditions.
■Condition
Item
Non-isolation bit input slave module (ASLINKER)
Connected load (three-wire sensor)
Transmission cable (DP, DN)
Supply voltage for the RJ51AW12AL
■Calculation result
Item
Calculation formula
I(A) = (Ihin m) = I(A) The maximum transmission cable supply current
Condition 1
(0.015 + (0.013 2)) 24 = 0.984A 1A
Vm(V) - V(V) 20V
Condition 2
24 - (0.984 100 0.015 2) = 24 - 2.95 = 21.05V 20V
Vm(V) - V(V) The lowest allowable voltage of the connected load
Condition 3
The lowest limit of the allowable voltage range for connected load = 24 - 24 0.1 = 21.6V
21.05V < 21.6V
The calculation results of the conditions 1) to 3) show that the system cannot be configured.
However, the system can be configured if the power supply for the RJ51AW12AL is changed to 24.55VDC or higher.
Description
■Transmission cable supply current (I(A))
Page 26 Transmission cable supply current (I(A))
■Cable resistance R ()
= Cable length (m) Conductor resistance (/m) 2
• Wire diameter 1.25 Conductor resistance 0.015/m
• Wire diameter 0.75 Conductor resistance 0.025/m
Number of bit data points
Module current consumption
Number of modules
Three-wire sensor current
consumption
Number of sensors
Power supply voltage
Wire diameter
Power supply voltage
5.2 Power Supply to the AnyWireASLINK System
Description
2 points
15mA
24
13mA
2
24VDC 10%
1.25
24VDC
Result
Satisfied
Satisfied
Not satisfied
5 SYSTEM CONFIGURATION
5
27
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