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There are two Adapter Brackets used for mounting a 10-slot Series 90-30 baseplate to a 19” Rack. Regardless of which of the two Adapter Brackets is used, the 19” Rack should be grounded as per the instructions in “System Grounding Procedures,” including Figure 2-10. (For details on the Adapter Brackets, see the “Mounting a Baseplate to a 19” Rack” section earlier in this chapter.) Nineteen-Inch Rack-mounted PLC baseplates should be grounded according to the guidelines in the “Baseplate Safety Grounding” section, using a separate ground wire from the PLC baseplate as shown in the previous figure (Fig. 2-11). Ŷ If using the Recessed Mount Adapter Bracket (IC693ACC313), the ground wire can be installed as shown in Figure 2-11 with the ground attached to the Recessed Mount Adapter Bracket. An additional ground wire connecting the Adapter Bracket to a solid chassis ground on the 19” Rack should be installed. Use the same or equivalent hardware and paint removal scheme as shown in Figure 2-11. Ŷ If using the Surface Mount Adapter Bracket (IC693ACC308), the ground wire should be run from the baseplate as shown in Figure 2-11, to a solid chassis ground on the 19” Rack. Use the same or equivalent hardware and paint removal scheme as shown in Figure 2-11. Programmer Grounding For proper operation, the computer (programmer) running the PLC software must have a ground connection in common with the CPU baseplate. Normally, this common ground connection is provided by ensuring that the programmer’s power cord is connected to the same power source (with the same ground reference point) as the baseplate. If it is not possible to ensure this common ground scheme, use a port isolator (IC690ACC903) between the programmer and PLC serial connection. If the programmer ground is at a different potential than the PLC ground, a shock hazard could exist. Also, damage to the ports or converter (if used) could occur when the programmer serial cable is connected between the two.