Modicon M580 Plc Page 2-34 I/O architectures

2/34 Composition Modicon STB distributed I/O solution Open and modular system Composition of a Modicon STB island (1) A Modicon STB island is made up of one or more segments comprising PDMs (Power Distribution Modules) and I/O modules. The island begins with a NIM network interface module and ends with a bus terminator supplied with the NIM. An island can be made up of a single segment or a primary segment and up to 6 expansion segments. The islands segments are chained by EOS (End Of Segment) and BOS (Beginning Of Segment) internal bus expansion modules. On each segment: b Place the PDMs immediately to the right of the network interface modules or expansion modules. b Place the I/O modules to the right of the PDM module supplying them with power. b Each module (with the exception of the NIM network interface module), is held in a fixing base on the DIN rail . Three module and base widths are possible. On the DIN rail, the overall width needed for a segment is the sum of widths of the network interface module, the bases and any bus terminator. The bases provide continuity of the internal bus, auto-addressing of the modules, and separated and isolated distribution of the internal power supplies, actuators (outputs) and sensors (inputs). The advantages of this arrangement are: b Unplugging modules: v When switched off (cold swap) , modules can be unplugged very quickly v When switched on (hot swap) , I/O modules can be unplugged provided the network interface module is the standard type b Output power supply independent of inputs: For example, if an output power supply is cut by a Preventa module, the inputs are still managed. b Immunity of inputs: For example, the closing of power contactors (controlled by outputs) does not disturb analog input measurements. Network Interface Module (NIM) : This module manages communications on the island bus. It acts as a gateway for exchanges with the fieldbus or network master. Various NIM network interface modules (only standard type) are available for the following major fieldbuses or industrial networks: b Ethernet Modbus TCP/IP: Single or double port Network Interface Modules b EtherNet/IP, Modbus Plus and Fipio: Only standard type NIM network interface modules b CANopen, I NTER B US , Modbus Plus, Fipio, Profibus DP and DeviceNet (1) For further information, please consult our "Modicon STB IP 20 distributed I/O" catalog available on our website 2 1 3 4 5 6 7 8 9 10 2 1 3 4 5 6 7 8 9 10 2 1 3 4 5 6 10 2 1 3 4 5 6 10

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