AL16AN Programmable Logic Controller Instruction ... - FF-Automation

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Page 5 - 230/05/99AL16AN Instruction ManualEvery digital input and output line has an individual indicatior light showing the state ofthe line (lit = 1, dark = 0). The indicator lights are located adjacent to the approriate inputor output terminal strip (amber = input, red = output, as shown in the figure below.5.2 Expansion boards AL32EX and AL32EXAAL32EX: The digital inputs and outputs have indicator lights arranged in the same wayas on the basic board.AL32EXA:Indicator lights for supplyvoltages ( +5 V adjacentto ribbon cable connector,+24 V adjacent to terminalstrips)5.3 Expansion board AL32EXOFF-Automation Oy
AL16AN Instruction ManualPage 6 - 130/05/996. INSTALLATION AND CONNECTIONS6.1 Environmental requirementsThe inputs and outputs of the AL16AN are not isolated. The serial connectors RS232and parallel with is not isolated from PLC’s internal voltages. The RS485 serial communicationis isolated by aditional isolation module from PLC’s internal voltages. Toensure proper function of AL20AN must the circumstances of installing place be carefullyconsidered.Operating temperature + 5 to + 45°CMoisture, corrosive gases, liquids and conductive dust may not exist in thespace, where PLC boards are installed.The PLC boards don't resist heavy vibration very well.The distance from electromagnetic fields generating devices, such as electricmotors, switch gears, thyristors, welding equipment switched power suppliesand power converters/inverters has to be wide enough.PLC boards are quite immune against light sources, but the possible erasingwindow on the system program EPROM has to be well covered.If some item above or any other feature in surrounding 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 in theirown enclosure near the PLC. All the contactors connected to PLC have to beequipped with RC protection devices and the 24 VDC control relays with extinguishdiodes.6.2 Field wiring6.2.1 Earthing/groundingThe metal parts of the PLC enclosure must be connected to the plants logic ground.6.2.2 Power supply connectionsNormally no functional grounding is necessary when 24 volt floating voltage system isused with the PLC’s power supply connection. It is important that the 24 volt wiring iscarefully kept isolated from ground level and 220 volt supply voltages.The CPU board, AL16AN receives the +24 V DC supply voltage from an external, isolatedpower supply unit (such as AL 9624/3.5 or AL 9624/8). The controller convertsthis to the +5 V and +15 V supplies it requires.FF-Automation Oy
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AL16AN Programmable Logic Controller Instruction ... - FF-Automation

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