Data That Are Cyclically Exchanged; Alarms And Messages; Retentive Data; Non-Retentive Data - Siemens SINUMERIK 828D Function Manual

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Data that are cyclically exchanged

Data which is exchanged between the PLC and NC on one side as well as between the PLC and HMI on the

Data to the PLC are provided by the firmware at the cyclic start of the user program. This ensures, for example,

that the signals from the NCK remain constant throughout a cycle.

The firmware transfers data from the PLC to the NKC or HMI at the cycle end of the user program.

Interface PLC ↔ NCK

The cyclic data include e.g. status signals ("program running", "program interrupted") and control signals (start,

stop) and auxiliary and G functions.

Data are structured in signals for:

Axes/spindles

General NCK signals

Interface PLC ↔ HMI

These are signals for:

Program selection via lists

Messenger control command

General signals from/to HMI

Signals from/to the maintenance planner

Signals from operator panel (retentive area)

General selection/status signals from/to HMI (retentive area)

The user interface in DB1600 offers the option of displaying fault and operating messages on the HMI.

The firmware evaluates the signals that have been entered and sends these as coming and going alarms and

messages to the HMI where they are displayed. The HMI manages the fault texts.

For the retentive data there are the user data blocks DB9000 - DB9063 and the data area DB1400.DBW0 -

DBW127. There the user can store all data that should remain valid after POWER OFF/ON. The retentive data is

stored in the non-volatile memory, however, not for data backup.

Non-retentive data (e.g. bit memories, timers and counters) are deleted every time the control is booted.

Basic Functions

Function Manual, 09/2011, 6FC5397-0BP40-2BA0

P4: PLC for SINUMERIK 828D

14.1 Overview

Sinumerik 840d sl