P4: Plc For Sinumerik 828D; Overview; Plc Firmware; Plc User Interface - Siemens SINUMERIK 840D sl Function Manual

P4: PLC for SINUMERIK 828D

14.1

Overview

14.1.1

PLC firmware

The PLC of the SINUMERIK 828D is an integrated PLC based on the SIMATIC S7-200
command set.
The PLC user program is essentially programmed using a Windows PC with the "PLC
Programming Tool". In addition, the PLC can be diagnosed and edited via the operator
interface of the control. A "Ladder-Add-On-Tool" is available in the control for this purpose.
Note the following special features:
● The PLC user program is completely programmed in ladder logic (LAD).
● A subset of the programming language of the S7-200 is supported.
● When loading to the CPU, in addition to the code for execution, the complete project data
(including symbols and comments) is loaded into the control. This means that the control
always has the project that matches the currently running PLC user program.
● When loading from the CPU, the complete project data (including symbols and comments)
is loaded into the PLC Programming Tool and can be processed/edited using this.
● The user must manage the data and process information according to type. The declared
data type must be used consistently each time that the data is accessed.
14.1.2

PLC user interface

The user interface is set-up by the PLC firmware, which also organizes the exchange of all
signals and data between the PLC on one side and the NCK and HMI on the other side.
The user interface comprises the parts:
● Data interface with cyclic exchange (see "Data interface (Page 1086)")
● Function interface with function or task-related data exchange (see "Function interface
(Page 1100)").
The structured data of these interfaces (retentive and non-retentive) are made available to the
user by the firmware by assigning to data blocks: The NC (NCK, tool manager, NC channel,
axes, spindles, ...) and the HMI are "Communication partners" of the PLC user program.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
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