AL 20AN Programmable Logic Controller ... - FF-Automation
AL 20AN Programmable Logic Controller ... - FF-Automation
AL 20AN Programmable Logic Controller ... - FF-Automation
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AutoLog AutoLog <strong>20AN</strong> <strong>20AN</strong> Instruction Käsikirja ManualPage Sivu 65 - 129/12/200604/01/996. INST<strong>AL</strong>LATION AND CONNECTIONS6.1 Environmental requirementsThe inputs and outputs of the <strong>AL</strong><strong>20AN</strong> CPU board are isloated in group and theisolation of the inputs on expansion boards and DIN modules depends onconstruction of board. More information of isolation in following chapters. Theserial connectors RS232 and parallel with it RS485 (SER2) and RS232 (SER1)are not isolated from PLC’s internal voltages. To ensure proper function of<strong>AL</strong><strong>20AN</strong> the installation circumstances must be carefully considered.Operating temperature + 5 to + 45°CMoisture, corrosive gases, liquids and conductive dust must not be presentwhere PLC boards are installed.The PLC boards don't resist heavy vibration very well.The distance from electromagnetic field generating devices, such as electricmotors, switch gear, thyristors, welding equipment, switched power suppliesand power converters/inverters must be adequate.PLC boards are quite immune against powerfull light sources.If some item above or any other envinronmental feature may cause errors to PLCfunction it is advisable to install the PLC in the steel plate enclosure. It is also advisableto install possible auxiliary input/output relays fuses and power units intheir own enclosure near the PLC. All the contactors connected to PLC have to beequipped with RC protection devices and the 24 VDC control relays withextinguish diodes.6.2 Field wiring6.2.1 Earthing/groundingThe metal parts of the PLC enclosure must be connected to the plant’s logicground.6.2.2 Power supply connectionsNormally no functional grounding is necessary when 24 volt floating voltagesystem is used with the PLC’s power supply connection. It is important that the 24volt wiring is carefully kept isolated from ground level and 230 volt supply voltages.The CPU board, <strong>AL</strong><strong>20AN</strong> receives the +24 V DC supply voltage from an external,isolated power supply unit (such as 24VDC /1.2A or 24VDC /2.5A). The controllerconverts this to the voltages it requires.<strong>FF</strong>-<strong>Automation</strong> Oy
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