Programmable Controllers: Theory and Implementation

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ntroduction to PLC Programming and Implementation—from relay logic to PLC logic(c)InputsOutputsL1 L2L1 L2PB14InputOutputPL3000020LS7001 021SOL3PS7002ProgramCoding022SOL4LS8SEL003004023024PL4SOL5LS9005025Start006026Reset00702714 c–ensure safety15 b–in series16 d–to shut down the system if there is a PLC failure17 A safety control relay is used to remove power from the I/O modules during a system error.When a malfunction occurs, the safety control relay will turn off, opening its SCR contact tostop the flow of power to the connected devices.18 false; most of the time a normally closed input device is programmed as normally open;however, the programming of the input will depend on its function in the program19 The normally closed PLC fault contacts are used to energize the PLC failure alarm. If the PLCfails, the PLC fault coil will not energize. Therefore, the normally open PLC fault contacts willnot close to provide power to the connected devices. Instead, the normally closed PLC faultcontacts will remain closed, sounding the PLC failure alarm.Industrial Text & Video Company www.industrialtext.com 1-800-752-839866
Introduction to PLC Programming and Implementation—from relay logic to PLC logic20 (a)ModuleTypeRackI/O AddressGroupTerminalInput0 1 0 LS140 1 1 SS30 1 2 PS10 1 3 S40 1 4 LS150 1 5 SS40 1 6 —0 1 7 —DescriptionOutput0 5 0 SOL7• • •• • •• • •Internal1 0 0 CR10(b)010 011100012100100013 01401505021 true22 d–an internal output23 There is a possibility of bidirectional power flow through the normally closed contact CR1in line 3. A PLC will only allow power to flow in a forward path. Therefore, if the reverse pathfrom line 4 to line 2 is meant to be followed, the circuit would have to be reconfigured so thatthe CR1 contacts are included in both lines 2 and 4.24 coding25 (a)DeviceInternalDescriptionTMR1100Used to trap TMR1C R1— Same as SOL1C R2— Same as SOL2CR3101Replace CR3TMR1200Timer 1TMR2201Timer 2Industrial Text & Video Company www.industrialtext.com 1-800-752-839867
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Programmable Controllers: Workbook/
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Programmable Controllers: Theory and Implementation

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