High Speed Counter Setup - CPU Based

This help topic covers the basics of the CPU built-in high speed counter feature and walks through an example to configure this feature and how to program to use this feature.

All of the XEM CPU modules support the same high speed counter feature. Here is the summary of their specifications.

Feature XEM-DN/DP32H2 and XEM-DN/DP32HP
Number of counter inputs 4 (Channel 0-3)
Counter Mode Linear or Ring
Pulse Input Mode 1 Phase 1 input, 1 Phase 2 inputs, CW/CCW or 2 Phases (x4)
Maximum Count Speed 200kpps (1 phase) or 100kpps (2 phases)
Count Range -2,147,483,648 to 2,147,482,647 (DINT)
Compare Mode 2 compare modes per channel
Presets Internal and External

XG5000 has a window that makes the high speed counter configuration easier.

Double-click High Speed Counter in the Project window.

The Special Module Parameter window opens.

The XEM CPU modules support 36 predefined flags for each channel. You can use these flags for programming and monitoring.

Double-click Global/Direct Variables in the Project window.

Step Action
1 Select the Flag tab.
2 Select High Speed Counter.
3

Uncheck All.
4 Enter the channel number (0-3).

There are 2 counter modes available.

Linear CounterClosed
Counting pulses in the range of -2,147,483,648 to 2,147,482,647.

1. The counter stops increasing after reaching the maximum limit, but it can still decrease.
2. The counter stops decreasing after reaching the minimum limit, but it can still increase.
3. These Borrow and Carry flags are available as the system defined high speed counter flags.

Ring CounterClosed

1. Users can configure the maximum and minimum count values.
2. This Carry flag is available as a system defined high speed counter flag.

There are 4 pulse input modes available.

1-Phs 1-In x1Closed

1-Phs 2-In x1Closed

CW/CCWClosed

2-Phs x4 (2 Phase, x4)Closed

Each high speed counter channel has two sets of Compare Modes that are named Compare 0 Mode and Compare 1 Mode.

Each Compare Mode supports seven conditions to evaluate the Present Value (Current count value) with up to two compare setup values (Minimum and Maximum Setting) and controls the Comparator Output flag. A digital output built in the CPU module can also be controlled (this is optional).

Note: The Comparator Output flag is a predefined high speed counter flag.

Condition Minimum Setting Maximum Setting Comparator Output Flag Digital Output
(Optional)
(Present Value)< Required Not required On if Present Value < Minimum Value. On if the Comparator flag is on.
(Present Value)<= Required Not required On if Present Value <= Minimum Value. On if the Comparator flag is on.
(Present Value)= Required Not required On if Present Value = Minimum Value. On if the Comparator flag is on.
(Present Value)>= Required Not required On if Present Value >= Minimum Value. On if the Comparator flag is on.
(Present Value)> Required Not required On if Present Value > Minimum Value. On if the Comparator flag is on.
(Range) Include Required Required On if Present Value >= Minimum Value and Present Value <= Maximum Value. On if the Comparator flag is on.
(Range) Exclude Required Required On if Present Value <= Minimum Value or Present Value >= Maximum Value. On if the Comparator flag is on.

There are 2 types of presets available.

Internal Preset

When the Internal Preset Enable flag is turned on, the value stored in the Internal Preset Setting Value variable is set as the count value for the channel.

Item CH 0 CH 1 CH 2 CH 3
Internal Preset Enable

_HSC0_IntPrs_En
(%KX4161)

_HSC1_IntPrs_En
(%KX4321) 		_HSC2_IntPrs_En
(%KX4481) 		_HSC3_IntPrs_En
(%KX4641)
Internal Preset Setting Value _HSC0_IntPrs_Val
(%KD152) 		_HSC1_IntPrs_Val
(%KD167) 		_HSC2_IntPrs_Val
(%KD182) 		_HSC3_IntPrs_Val0
(%KD197)

External Preset

To use this External Preset, turn on the External Preset Enable flag assigned to the channel first. After that, when the External Preset Command turns on, the value stored in the External Preset Setting Value variable is set to the channel as the count value.

Item CH 0 CH 1 CH 2 CH 3
External Preset Enable _HSC0_ExtPrs_En
(%KX4162) 		_HSC1_ExtPrs_En
(%KX4322) 		_HSC2_ExtPrs_En
(%KX4482) 		_HSC3_ExtPrs_En
(%KX4642)
External Preset Command %IX0.0.4 %IX0.0.5 %IX0.0.6 %IX0.0.7
External Preset Setting Value _HSC0_ExtPrs_Val
(%KD153) 		_HSC1_ExtPrs_Val
(%KD168) 		_HSC2_ExtPrs_Val
(%KD183) 		_HSC3_ExtPrs_Val
(%KD198)

%IX0.0.0 - %IX0.0.7 can be assigned to the high speed counter feature on all XEM CPU modules.

Channel Pulse Input External Preset Command Input
CH 0 %IX0.0.0 %IX0.0.4
CH 1 %IX0.0.1 %IX0.0.5
CH 2 %IX0.0.2 %IX0.0.6
CH 3 %IX0.0.3 %IX0.0.7

Important!

When a pulse input mode uses 2 pulse inputs, the mode must use CH 0&CH 1 or CH 2&CH 3 for the pulse inputs. Other combinations are not allowed.

Pulse Input Mode Number of Pulse Inputs to Use Available Channels
1 Phase 1 input 1 CH0, CH1, CH2 or CH3
1 Phase 2 inputs 2 CH 0 & CH 1 or CH 2 & CH 3
CW/CCW 3 CH 0 & CH 1 or CH 2 & CH 3
2 Phases (x4) 4 CH 0 & CH 1 or CH 2 & CH 3

Count pulses from an encoder and turn %QX0.0.0 on when the count value is between 500 and 700.

System Configuration

Step Action
1

Configure the high speed counter channel 0 (CH 0) and channel 1 (CH 1) like follows.

  1. Select 2-Phs x 4 (2 Phases (x4)) as the Pulse Input Mode for CH 0. Notice CH 1 is grayed out because CH0 and CH1 need to be used as pair for this mode.

  2. Select (Range) Include for the Compare 0 Mode because we want to turn %QX0.0.0 on when the counter value is between 500 and 700.

  3. Enter 700 as the Compare 0 Max. Setting value.

  4. Enter 500 as the Compare 0 Min. Setting value.

  5. Select QX0.0.0 as the Compare 0 Output Point.
2

Connect the encoder to the XEM CPU module.

Also connect 24V and 0V correctly according to the CPU module type.
3

Write a program.

LD (Ladder)

ST (Structured Text)
4

Results:

Current Count Value = 365

Current Count Value = 570

Current Count Value = 712

 

 

 

 

 

 

 

 

LP524