Siemens SIMATIC NET 12M Operating Instructions Manual

Also see for SIMATIC NET: Operating instructions User manual Installation instructions Manual Configuration manual

D-sub male connectorThe D-sub male connector is plugged into the D-sub female connector of the DTE and securedby screws. The 12M bus terminal requires a current of 90 mA with a voltage of 5 V supplied bythe DTE between pins 5 (M5) and 6 (P5) of the D-sub male connector.Pin no. Short name Meaning1 PE Protective earth, connected to the cable shield2 nc3 B (RxD/TxD-P) Signal line B4 nc5 M5 (DGND) Chassis connection of the 5 volt supply6 P5 (VP) + 5 volt connection, 90 mA required7 nc8 A (RxD/TxD-N) Signal line A9 ncCasing PE Protective earth, connected to the cable shieldD-sub male connector pinoutThe impedance of the PROFIBUS interface when receiving must be ≥ 10 kilohms (according tothe EIA standard RS-485). The spur line must not be terminated.Segment length and transmission speedTransmission speed maximum segment length9.6 - 187.6 kbps 800 m500 kbps 400 m1.5 Mbps 200 m3 - 12 Mbps 100 mPermitted segment lengthsBus cable for PROFIBUS, standard type (see catalog IK PI).NoteRestriction when using the 12M bus terminal at 500 kbpsThis restriction only affects segments longer than 80 m.If the 12M bus terminal is used at a transmission rate of 500 kbps along with several RS-485 busterminals with a spur line length of 3.0 m, a minimum distance of 5 m of PROFIBUS cable mustbe maintained between two RS-485 bus terminals.You can locate 12M bus terminals anywhere in the segment; there is no minimum distancebetween them that needs to be kept to. You can also arrange a 12M bus terminal between twoRS-485 bus terminals with 3.0 m spur lines if you make sure that the PROFIBUS cable betweentwo RS-485 bus terminals has a total length of at least 5 m.Introduction1.2 Description of the product12M bus terminalOperating Instructions, 06/2022, C79000-G8976-C333-02 9