Title: 36 Siemens GDB181-MO.pdf.pdf
Operating VoltagePermissible voltage dropFormula for cable lengthAC 24 V4 % of AC 24 VL =1313 ·PA[m]A Cross-sectional area in [mm2] L Permissible cable length in [m]P Power consumption in [VA] or [W];refer to the actuator’s type fieldOperating VoltagePower consumptionPerm. voltage drop for line...1 (G), 2 (G0)AC 24 V3 VA4 % of AC 24 VDetermine the cable lengths for 4 actuators operating on AC 24 V. Decisive for sizing the cable are only the AC currents on lines 1 (G) and 2 (G0). Maximum permissible voltage drop = 4 % per line.Consumption = 4 x 3 VA = 12 VALine current = 4 x 0.125 A = 0.5 APermissible single cable length for G and G0:164 m with a cross-sectional area of 1.5 mm2 · 274 m with a cross-sectional area of 2.5 mm25.2.2 Bus cablingInstructions regarding topology and addressing in Modbus RTU networks can be found in [8]. The following sections presuppose electrical installations that conform to the protocol-specific requirements.