Abb Cable Tk505 - ABB ACS310 Quick Start Manual

Quickstart Guide
ABB PLC and drives integration using Modbus RTU
Bus line
Construction
Conductor cross section
‐recommendation
Twisting rate
Core insulation
Resistance per core
Characteristic impedance
Capacitance between the cores
Terminating resistors
Remarks
ABB cable TK505
For an easy Modbus installation in the CPU end, the pre‐made ABB cable TK505 can be used. It includes a 9 pole D‐
sub contact with built‐in end termination (120 Ω) and pull‐up/pull‐down resistors (2*270 Ω). This contact is
suitable for AC500‐eCo COM1. It can also be used for AC500 COM2 (even though another voltage level is used),
but only if the GND wire is not connected to the Modbus slaves (2‐wire solution, preferred for AC500 COM ports).
Modbus RTU
2 cores, twisted, with common shield
2
>0.22 mm (24 AWG)
2
0.5 mm corresponds to Ø0.8 mm
<10/meter (symmetrically twisted)
Polyethylene (PE)
<100 Ω/km
Appr. 120 Ω (100...150 Ω)
<55 nF/km (if higher, then max bus length
must be reduced)
120 Ω, ¼ W at both line ends
Cables with PVC core insulation and a core
diameter of 0.8 mm can be used up to a
length of appr. 250 m. In this case, the bus
terminating resistor is appr. 100 Ω.
‐ 9 ‐ PLC and drives integration