Siemens SINUMERIK 840C CNC System Installation and Debugging Guide

End universal reset mode: Trigger power on reset to make the settings effective.

Important note: Starting from software version 6, NCK's SRAM will automatically clear upon software updates or CSB battery failures to ensure the defined initial state.

2. Memory configuration (software version 3 and above)

Users can flexibly configure the allocation of DRAM and SRAM according to their needs:

DRAM: Used for storing part programs, UMS, IKA data, block buffers, measurement value storage, etc. The capacity depends on the software version (such as SW 4.1-4.3 supporting a maximum of 2760 kB of part program storage).

SRAM: Used for tool compensation, R parameters, and other data that need to be powered off to maintain. The total capacity is 64 kB, which can be allocated between tool compensation and R parameters.

After changing the memory configuration, the 'NCK Format User Memory' operation must be performed in universal reset mode.

3. Machine tool data loading

Standard data or user files can be loaded through the "Machine Data Dialogue". At initial startup, the system loads standard data files under the SIEMENS branch (such as STAND_T, STAND_M). Subsequent launches can load customized files under the user branch. If the file contains driver data, it is necessary to confirm the driver related alarms during the loading process and reload the driver configuration after completing the universal reset.

PLC installation and diagnosis

1. PLC CPU version and connection

840C supports three types of PLC CPUs:

PLC 135 WB2 (with EPROM submodule, suitable for software version 2 and below).

PLC 135 WB2 (with REST EPROM submodule, software version 3 and above).

PLC 135 WD (no interface PLC, software version 3 or above).

Programming devices are limited to the PG 7xx series and are connected via NC-PG cables. The interface parameters are fixed at 9600 baud, even parity, and 2 stop bits.

2. PLC universal reset and start

Before starting the PLC, the user program needs to be loaded into the RAM of the PLC CPU. For software versions 3 and above, programs are usually loaded from the hard drive. In the universal reset mode, the "PLC initial clear" can be executed to delete the user program in RAM, and then the ANW-PROG file can be loaded from the hard disk. If the file does not exist, the RAM remains empty.

3. PLC diagnostic function

The system provides multiple diagnostic tools:

LED display: Indicates hardware malfunction.

System initialization program: Check the startup conditions and decide whether to perform a cold start or a hot start.

Detailed Error Code (USTACK): Provides precise error information when the PLC stops, which can be accessed through Diagnosis>Service Display>PLC Service.

PLC status: can view and modify the values of input/output words, flag words, data words, timers, and counters (password required).

Timeout analysis: By setting the MD bit 6049.0 of the PLC operating system, buffer access to the communication/local bus can be disabled to accurately locate the cause of timeout.

MMC regional diagnosis and configuration

1. Password protection

Both NCK and MMC regions are password protected. The password is set through NC MD 11, with a default value of 0 corresponding to password 1111. Passwords can be set or deleted in the diagnostic area. Password error will prompt 'PASSWORD INCORRECT'.

2. Language switching (software version 5 and above)

At the initial screen of the diagnostic area, the language of subsequent input screens can be switched through the soft key "Language/Sparche". The switchable areas include system (MMC, NCK), WOP, simulation, and PG software. Only installed languages will appear in the switching options.

3. Screen hard copy printing

Hard copies are stored in compressed TIFF or PCX format and can be transmitted via RS232 interface. The format is set in the BEDCONF configuration file (such as a 15 1 CO for color and a 15 6 TIFF for TIFF format).

4. PC data management and configuration editing

Users can access MMC's file system through Diagnosis>Startup>PC Data. The system data is stored in two branches, SIEMENS and USER. The USER branch is editable, while the SIEMENS branch is the default setting for protected systems. The 'PRESSET' soft key can be used to copy files from the SIEMENS branch to the USER branch.

The key configuration files include:

CONFIG file: defines language, operation panel interface, alarm log format, message priority, etc.

BEDCONF file: Parameterize the overall behavior of the operating system, such as application management, color mode (CO/MO), display mode (PO/NE), screen saver time, etc. Editors need to be extra cautious, as errors can lead to system failures.

Color Chart (CLUT) and Color Mapping List: Allow users to customize the color scheme for each display area.

5. Data Backup (Backeup)

By using VALITEK streaming tape drive or PC link, all data on the hard drive (system software, user software, part programs, machine data) can be fully backed up. This is a necessary measure to prevent data loss caused by MMC CPU failure. The backup function is located in the Diagnosis>Startup>ACKUP menu, where you can select operations such as backing up the system, backing up user data, and restoring the system.