Schneider PLC TWIDO

Description
Twido Compact
“All in one” product, screw terminal connection
10 compact bases, 10, 16, 24 and 40 I/O, including 6 expandable bases using 4 to 7 digital (different connection methods) or analogue I/O modules, together with options: display, real-time clock, memory…
Supply 24 V DC or 100… 240 V AC
Modbus, CANopen, Ethernet (integrated on 40 I/O)

Twido Modular
Very compact (40 I/O within 95 x 90 x 70 mm), removable screw terminals or HE10 (pre-wired) connection
5 bases, 20 or 40 I/O, expandable using 4 to 7 digital (different connection methods) or analogue I/O modules, together with options: display, real-time clock, memory…
Supply 24 VDC
Modbus, CANopen, Ethernet

Twido Extreme
IP67, temperature -40° to +110°C
1 non expandable base, 41 I/O (Digital, Analogue or PWM)
Supply 12 or 24 VDC
Modbus, CANopen, CAN J1939 integrated

SIMATIC C7 626

The SIMATIC C7 626 control systems combine a programmable controller and an operator panel in one unit. This enables complete machine control system to be implemented with minimum size, at an economical price.

Some applications of SIMATIC C7 626 control system are

General Engineering Systems

Special Machines

Plastic Industry Machines

Textile Machines

Tobacco Machines

Packing Machines

The SIMATIC C7 626 system can be operated in many types of environments.

The system consists of the following individual components:

SIMATIC S7 300 consisting of CPU, Signal Modules and interface board. The performance is about equal to SIMATIC S7 CPU 314 - 315 2DP.

Simatic Operator Panels OP3, OP7, OP17 or OP25.

The process control system SIMATIC PCS 7

The SIMATIC PCS 7 distributed control system enables you to respond swiftly to constantly changing market requirements. Integrated safety concepts ensure continuous operation of your systems and protect man, machine and the environment. The SIMATIC PCS 7 offers high system availability, investment security and future-safe technology, together with a reduced total cost of ownership.



SIMATIC PCS 7 offers more than a conventional process control system: a scalable system architecture, high performance engineering tools, additional features such as Alarm Management, Process Safety, Asset Management, a flexible modernization strategy of previously installed systems – all of these are unique advantages your business will benefits.

High-performance system components, redundancy on all levels, and engineering
tools that are easy to use – this is how SIMATIC PCS 7 offers you more reliability and increased performance across your entire system and the entire life cycle of your plant.

Getting Started with High Speed Counters in Siemens Step 7.... continue

Defining Counter Modes and Inputs

Use the High-Speed Counter Definition instruction to define the counter modes and inputs. This shows the inputs used for the clock, direction control, reset, and start functions associated with the high-speed counters. The same input cannot be used for two different functions, but any input not being used by the present mode of its high-speed counter can be used for another purpose. For example, if HSC0 is being used in mode 1, which uses I0.0 and I0.2, I0.1 can be used for edge interrupts or for HSC3.

Four counters have three control bits that are used to configure the active state of the reset and start inputs and to select 1x or 4x counting modes (quadrature counters only). These bits are located in the control byte for the respective counter and are only used when the HDEF instruction is executed.





Setting the Control Byte
After you define the counter and the counter mode, you can program the dynamic parameters of the counter. Each high-speed counter has a control byte that allows the following actions:
- Enabling or disabling the counter
- Controlling the direction (modes 0, 1, and 2 only), or the initial counting direction for all other modes
- Loading the current value
- Loading the preset value

Setting Current Values and Preset Values
Each high-speed counter has a 32-bit current value and a 32-bit preset value. Both the current and the preset values are signed integer values. To load a new current or preset value into the high-speed counter, you must set up the control byte and the special memory bytes that hold the current and/or preset values, and also execute the HSC instruction to cause the new values to be transferred to the high-speed counter. Table 6-29 lists the special memory bytes used to hold the new current and preset values. In addition to the control bytes and the new preset and current holding bytes, the current value of
each high-speed counter can only be read using the data type HC (High-Speed Counter Current) followed by the number (0, 1, 2, 3, 4, or 5) of the counter. The current
value is directly accessible for read operations, but can only be written with the HSC instruction.

Addressing the High-Speed Counters (HC)

To access the count value for the high-speed counter, specify the address of the high-speed counter, using the memory type (HC) and the counter number (such as HC0). The current value of the high-speed counter is a read-only value that can be addressed only as a double word (32 bits).

Getting Started with High Speed Counters in Siemens Step 7....

In this post, i will explain the use of high speed counters in Step-7 PLCs. Typically, a high-speed counter is used as the drive for a shaft timer, where a shaft rotating is fitted with an incremental shaft encoder. The encoder provides a specified
number of counts per revolution and a reset pulse that occurs once per revolution. The clock and the reset pulse from the shaft encoder provide the inputs to the high-speed counter.

The high-speed counter is loaded with the first of several presets, and the desired outputs are activated for the time period where the current count is less than the current preset. The counter is set up to provide an interrupt when the current count is equal to preset and also when reset occurs. Compare function is also used for this purpose to provide an interrupt when the current count is equal to the preset counts. We can easily use memory bits for the interrupt at different count positions i.e at different angels.

You can use the HSC Instruction Wizard to configure the counter. The wizard uses the following information:

Type and mode of counter, counter preset value, counter current value, and initial counting direction. To start the HSC Instruction Wizard, select the Tools, Instruction Wizard menu command and then select HSC from the Instruction Wizard window. To program a high-speed counter, you must perform the following basic tasks:

- Define the counter and mode.
- Set the control byte.
- Set the current value (starting value).
- Set the preset value (target value).
- Assign and enable the interrupt routine.
- Activate the high-speed counter.

to be continued....