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vtS7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31xA5E00105492-03 5-9Syr)6
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hpxPlease note the following points if you wish to arrange your modules on multipleracks:• The interface module always uses slot 3 (slot 1: power supply; slot 2: CPU, slot3: interface module)• It is always on the left before the first signal module.• No more than 8 modules (SM, FM, CP) are permitted per rack.• The number of modules (SM, FM, CP) is limited by the permitted current loadon the S7-300 backplane bus. The total power consumption must not exceed1.2 A per row.IrThe power consumption of the individual modules is given in the Hqyr9hhSrsr
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svhyyhvsurprpvSpecial shielding and grounding measures are not required if you interconnect theCU and EM using suitable interface modules (Send IM and Receive IM).However, you must ensure that• all racks are interconnected with low impedance,• the racks of a grounded assembly are grounded in a star pattern,• the contact springs on the racks are clean and not bent, thus ensuring thatinterference currents are dissipated.
