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....

Mitsubishi Q Series Input Module QX42D for High Speed Control....

[Features]
QX41-S1, QX42-S1
􀁹 High speed input module that provides response time 0.1ms.
(Response time is variable using GX Developer Version5 or later.)
􀁹 New positive common type 32-point and 64-point modules are now available, in addition to 16-point module
(QX40-S1).

QX42-S1 DC Input Module (Positive Common Type)
Type DC Input Module (Positive Common Type)
Specifications QX42-S1 Appearance
Number of input points 64 points
Isolation method Photocoupler
Rated input voltage 24VDC (+20/-15%, ripple ratio within 5%)
Rated input current Approx. 4mA
Input derating Refer to the derating chart.
ON voltage/ON current 19V or higher/3mA or higher
OFF voltage/OFF current 9.5V or lower/1.5mA or lower
Input resistance Approx. 5.6k
Set value 1 0.1 0.2 0.4 0.6 1
TYP. 0.05ms 0.15ms 0.30ms 0.55ms 1.05ms
OFF to ON
MAX. 0.12ms 0.20ms 0.40ms 0.60ms 1.20ms
TYP. 0.15ms 0.20ms 0.35ms 0.60ms 1.10ms
Response
time
ON to OFF
MAX. 0.20ms 0.30ms 0.50ms 0.70ms 1.30ms
Dielectric withstand voltage 560VAC rms/3 cycles (altitude 2000m (6557.38ft.))
Insulation resistance 10M or more by insulation resistance tester
By noise simulator of 500Vp-p noise voltage, 1 s noise width
Noise durability and 25 to 60Hz noise frequency
First transient noise IEC61000-4-4: 1kV
Level of protection IP2X
Wiring method for common 32 points/common (common terminal: 1B01, 1B02, 2B01, 2B02)
Number of occupied I/O points 64 (I/O assignment is set as a 64-point high speed input module)
Operation indication ON indication (LED), 32 point switch-over
Applicable connections 40-pin connector
Applicable wire size 0.3mm2 (For A6CON1)
Applicable wiring connector A6CON1, A6CON2, A6CON3, A6CON4 (Sold separately)
Applicable connector/terminal block
conversion module A6TBXY36, A6TBXY54, A6TBX70
5VDC internal current
consumption 90mA (TYP. all points ON)
Weight 0.18kg
QX42-S1
24VDC
4mA
QX42-S1

1: CPU parameter setting. (default: 0.2ms)
Response time is variable using GX Developer Version5 or later.
2: Pin number specifies the connectors; the first digit number “1” indicates left side connector and “2” indicates right side connector.
3: The LED displays X00 to X1F by turning the SW to F. It displays X20 to X3F by turning the SW to L.

FBs-1LC Fatek Load Cell input module...

Introduction

FBs-1LC is one of the analog input modules
of FATEK FBs series PLC. It can connect
one load cell input for weight measurement.
The conversion result is represented by a
signed 16 bit integer value. In order to filter
out the field noise imposed on the signal, it
also provides the average of sample input
function.

Specifications

Total Channels - One channel
Resolution- 16 bit (include signed bit)
I/O Points Occupied - 1 RI(Input Register) and 8 DO
Conversion Rate- 5/10/20/25 Hz selectable
Non-Linearity- 0.01% F.S. (@25℃)
Zero Drift- 0.2 μV/℃
Gain Drift- 10 ppm/℃
Excitation Voltage – 5V with 250Ω load
Sensitivity - 2mV/V, 5mV/V, 10mV/V, 20mV/V
Software Filter- Moving average
Average Samples- 1~8 configurable
Isolation- Transformer(Power) and photo-coupler(Signal)
Indicator(s) - 5V PWR LED
Supply Power- 24V-15%/+20%, 2VA
Internal Power Consumption- 5V, 100mA
Operating Temperature- 0 ~ 60 ℃
Storage Temperature- -20 ~ 80 ℃