1747-WINBAS  1747-WINBAS  1747-WINBAS

Principles of Machine Control
You enter a ladder logic program into the controller by using the 
software. The logic program is based on your electrical relay print 
diagrams. It contains instructionsthat direct control of your 
application.
With the ladder logic program entered into the controller, placing the 
controller in the Run mode initiates an operating cycle. The 
controller’s operating cycle consists of a series of operations 
performed sequentially and repeatedly, unless altered by your ladder 
logic program.
1. Input scan - The time required for the controller to scan and 
read all input data; typically accomplished within a few 
milliseconds.
2. Program scan - The time required for the processor to execute 
the instruction in the program. The program scan time varies 
depending on the instruction usedand each instruction’s status 
during the scan time.
3. Output scan - The time required for the controller to scan and 
write all output data; typically accomplished within a few 
milliseconds.
4. Service communication - The part of the operating cycle in 
which communication takes place with other devices, such as an 
HHT or a personal computer.
5. Housekeeping and overhead - The time spent on memory.
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Operation 
Cycle
Output
Scan
Service
Comms
Overhead
Input 
Scan
Program
Scan
IMPORTANT
Subroutine and interrupt instructions within your logic 
program may cause deviations in the way the operating 
cycle is sequenced.
Publication 1747-UM011G-EN-P - June 2008
Selecting YouSiemens 6FC5111-0CA02-0AA0 6FC5 111-0CA02-0AA0
Siemens 6FC5111-0CA01-0AA0 6FC5 111-0CA01-0AA0
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Siemens 6FC5203-0AB11-0AA2
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Siemens Simatic 6ES7422-1BL00-0AA0 6ES7 422-1BL00-0AA0
Siemens Simatic 6ES7416-3ER05-0AB0 6ES7 416-3ER05-0AB0
Siemens Netzgert 6EV1352-5BK00 6EV 1352-5BK00
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Siemens Simodrive 6SN1145-1BA01-0BA1
Siemens Sinumerik 6FC5447-0AA00-0AA1
Siemens Simadyn D 6DD1606-1AA0 
Danfoss VLT LC-FILTER 175Z0826
Danfoss Umrichter VLT 5005 175Z0559
Danfoss Umrichter VLT 5011 175Z0078
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Siemens Simodrive 6SN1118-0NJ00-0AA2
Siemens Simodrive 6SN1118-0DM31-0AA0 (B)
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Siemens Sinumerik 6FC5112-0DA01-0AA1 6FC51120DA010AA1
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