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Between every I/O connector pair, three faston connectors are available (in five groups) to connect power to the I/O module pairs. The faston connectors are marked as follows: • Tx-1 (connected to d32 and z32 of the I/O connector left and right) • Tx-2 (connected to d30 and z30 of the I/O connectors rack position 1 to 10) • Tx-3 (connected to d6 and z6 of the I/O connector left and right). The Tx-2 pins are used for the common 0 Vdc and are all interconnected on the I/O backplane. Each faston pin can handle 10 A. If any module in the rack requires 24 Vdc internal power (on pin d8 and z8), the internal power of 24 Vdc must be connected via two fastons: • T11-3: 24 Vdc, and • T11-2: common 0 Vdc. The watchdog (WDG), 5 Vdc and ground (GND) are connected to the I/O backplane via connector CN11 (see Figure 3 and Figure 4). Watchdog separation is possible by removing jumpers WD1 to WD3 and connecting a 5 Vdc or watchdog signal to the lower pin of the jumper. Jumper WD1 is the watchdog for the modules in rack positions 1 to 3 (group of three). Jumper WD2 is the watchdog for the modules in rack positions 4 to 6 (group of three). Jumper WD3 is the watchdog for the modules in rack positions 7 to 10 (group of four). The I/O backplane comes with two earth faston connections (T0 and T11-1). These earth connections should be terminated to the I/O rack frame using short wires (2.5 mm², AWG 14), e.g. directly to the nearest bolt on the 19-inch I/O rack.