ABB Procontic T300 Programmable Logic Controller in 35 ZE94 models

ABB Procontic T300 Programmable Logic Controller in 35 ZE94 models

Product Basics Overview

Functional features: ABB Procontic T300 is a programmable logic controller designed according to DIN 66264 standard, with multi-processor operation capability, integrating PLC, numerical control, industrial computer and other function blocks, which can complete complex automation tasks and be applied in many fields, such as binary, word and double word processing, closed-loop control, NC-axis control and so on.

Hardware Composition: 35 ZE94 consists of 35DS91 interface board and 35ZP93 processor board, with default configurations, such as baud rate 9600baud, station address ‘01H’ and so on. The front panel is equipped with LED indicator and restart key for displaying the operation status and restarting the device, and it can also be configured with functions such as programme memory through jumpers.

Programming Operation Details

Programming mode and auxiliary tools: Support instruction table, function block diagram and ladder diagram programming. Programming aids are classified into two categories: non-intelligent (e.g. ASCII keyboard, terminal) and intelligent (e.g. ABB Procontic Programming System), the latter can convert the written programme into instruction table and transfer it to PLC.

Programme creation and modification: Creating a programme involves a sequence of steps such as entering the programme, setting indirect constants and setting cycle times. Programs can be modified in the ‘abort’ and ‘run’ states. Modifications in the ‘run’ state are subject to certain limitations and specific operating procedures, and after modification, changes can be made effective or restored to the original state through relevant commands. After modification, you can use relevant commands to make the changes take effect or restore the original state.

EPROM Programming: User programmes and comments can be stored in EPROMs, different memory configurations require different types of EPROMs, programming requires connection to a programmer, setting relevant parameters, operating in accordance with specific steps, and may require a cold start before and after operation to ensure data security.

Operation Modes and Functions

Classification of operation modes: unit-specific modes (e.g. language selection, master-slave PLC setting, etc.) and programme-specific modes (e.g. NORMAL/TURBO mode, time/event control mode, etc.), some of the modes are mutually exclusive or coupled, and are set through KONFS commands, with changes taking effect in a variety of ways.

Operation and test commands: invoked through the terminal or programming system, covering the aspects of programme creation, testing and configuration. For example, the AEND command is used to prepare for modification of a running program, the FORCE command presets I/O signal values, KONFS is used to set modes, and DBV is used to edit the data block directory.

Data Management and Communication

Data block directory (DBV): It is responsible for assigning physical addresses to I/O operands, and has a default setting that can be modified by the user on demand, and the modification requires a hot start to take effect. Its position and structure in the transfer memory are fixed, and it contains pointers to physical devices for the correct addressing of I/O signals.

Communication with I/O modules: The PLC processes I/O signals through the process diagram, communicates with a variety of I/O modules (e.g. binary, analogue input and output modules), has default jumper settings, can perform I/O tests, and some modules have special functions (e.g. alarm inputs).

Communication with external devices: It can communicate with a variety of preprocessors, such as devices used for process display and control (35TA10 text display, 35BS40 operating station, etc.), industrial computers, communication processors, etc. The communication methods and functions vary depending on the device. In multiprocessor operation, data is transferred between master and slave PLCs via super global values, with attention to address assignment and writing rules.

System monitoring and maintenance

Self-diagnostic function: PLC carries out self-diagnostics during startup and operation, and sends out error messages through terminal display, LED indicator, error register record, etc., when it finds an error, and there are corresponding ways to deal with different types of errors, such as ignoring a specific job, terminating the programme, resetting the outputs, etc.

Monitoring Function: The monitoring function can access the PLC address area at the hexadecimal level and perform operations such as memory display, modification, and hardware test, etc., which are realised by specific commands, such as the H command to display the help text and perform hexadecimal calculations, and the D command to display the contents of the memory.

Memory Structure and Compatibility

Memory segmentation: Memory consists of several areas such as system RAM, transfer RAM, user program memory, etc. Each area has specific functions and address ranges, e.g., the user program memory segmentation varies according to the size of the memory, and contains program code, constants, and organisational directories.

System compatibility: The old system can be extended based on specific modules and software, and it is necessary to pay attention to the differences in data structure, I/O signal allocation, super global value, etc. The new version of PLC is upwardly compatible with the old version of user programme, but some functions change between different versions, and it is necessary to pay attention to it when using.