Start-Up
SINUMERIK 802S base line
4-9
Start-Up
4.3 Starting up the PLC
General
The PLC is a store-programmable logic controller for simple machines. It has
no hardware of its own and is used as a software PLC in the SINUMERIK 802C
base line control system.
The task of the PLC is to control machine-related functional sequences.
The PLC executes the user program cyclically. A PLC cycle is always executed
in the same sequence of order.
z
Update process image (inputs, outputs, user interface, timers)
z
Process communication requests (Operator Panel, PLC 802 Programming
Tool)
z
Execute user program
z
Evaluate alarms
z
Output process image (outputs, user interface)
The PLC executes the user program cyclically, starting from the first up to the
final operation. Access from user program is only carried out via the process
image and not directly to the hardware inputs or outputs. The hardware inputs
and outputs are updated by the PLC at the beginning and at the end of
program execution. The signals are thus stable over a PLC cycle.
The user program can be created by means of the PLC 802 Programming Tool
using the programming language S7-200 in conjunction with ladder diagrams
(LAD). A ladder diagram is a graphical programming language to represent
electrical circuit diagrams.
This Documentation describes the program structure and the instruction set of
the PLC in detail.
4.3.1 Commissioning of the PLC
The SINUMERIK 802S base line comes to the user with a simulation program
included.
The SAMPLE user program is stored in the permanent memory. This sample
program and the documentation are included in the SINUMERIK 802SC base
line Toolbox component “PLC802SC base line Library”.
The simulation program is intended for the first function test of the control
system after assembling the control.
Internal simulation program
The simulation program is an integral part of the 802S base line system
software. It allows operation of the control system even without connection to
input and output terminals. The user program processes all firmly defined keys
and the default setting of the axis keyboard (default).
Axes and spindle are switched to simulation mode. No real axis movement is
carried out. The Axis/Spindle Disable user signal is set for each axis. For this
reason, the movements of both axes and spindle are simulated virtually. The
user can use this program to test the interrelation of the components integrated
in CNC.
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