High speed counter counts 1 and 2 mode (circular or linear mode) specified in the DM6643 and DM6644, respectively. 1) ring-shaped pattern. Ring mode, CTBL (-) set the maximum count value in +1. Increment the counter when the maximum count value to 0, when declining counters count from 0 to the maximum value, not negative.Ring of points … Continue reading CQM1 1 and 2 the count of PLC high-speed counter mode

Ports 1 and 2 enter 3 type signals. For high speed counters 1 and 2 input mode is set in the DM6643 and DM6644, respectively. 1) phase difference mode (count rate =25kHz): 4x2 signal phase difference (phase a and phase b) and z signal for input. According to the phase 2 signal count increment or decrement. … Continue reading CQM1 PLC high-speed counter input 1 and 2 mode

When you reboot, you must use a method to reset the counter, when starting or stopping program execution, automatic reset of the counter. You can choose z signal + software reset or a software reset to reset the count of PV (set to 0), reset the same as high-speed counter 0.

There are 2 ways to read PV value, 1th from SR232 and SR233 (port 1) or SR234 and SR235 (port 2) read the 2nd use PRV (-) instructions.1) read SR232 and SR233 or SR234 and SR235.High speed counter 1 PV is stored in SR232 and SR233, high speed counter 2 PV is stored in SR234 … Continue reading CQM1 1 and 2 read the PV value of PLC high-speed counter

1. Look at the title bar and drawing catalogProject name, project, design date. 2. See drawing general information Sources of power supply, voltage levels, track laying, installation of equipment, the supplementary use of non standard graphic symbols, construction should pay attention to the matter. Some local problems is in the engineering drawings indicate, therefore reading engineering drawings … Continue reading The order of reading electrical diagrams

(1) the Zener diode. Zener diodes are made from Silicon-contact diodes, a stable DC voltage in an electronic circuit. In Figure 1-18, Zener diode in the circuit shown in Figure 1-19 typical applications and shapes.Typical application of Zener diodes in the circuit(2) the rectifier diode. Rectifier diode frequency suitable for public reference-state voltage lower VF … Continue reading General introduction to electronic devices

(1) clear purpose, make things simple. To read electronic schematics, we must first understand the purpose of this circuit, and then look at what is it electrical components. According to these components the whole circuit is divided into several parts, using block diagram form, relationships between the circuit and the circuit. This rough analysis can … Continue reading Read the basic methods of electronic circuit diagrams

Printed circuit board diagrams to represent the various components on the circuit board on the direction, position and volume. It can turn the circuit schematics and circuit board communication. Because can't see like electronic circuit components on the printed circuit arrangement, therefore, more difficult to read. Reading printed circuit board diagrams you can use the … Continue reading Read the basic method of printed circuit board layouts