Training: Functions Using PicoSoft Pico Controllers from Allen-Bradley

234 Pages·2010·1.11 MB·English

PROGRAMMABLE LOGIC CONTROLLERS
Pico Controllers
Training: Functions Using PicoSoft
The functions of the devices are shown here in a table. This enables you to select a device quickly according to the function
required. The numbers show how often a function can be used in the easy circuit diagram or Pico GFX. Simply click the number and
this will take you to a page which provides a download of an PicoSoft program file for the selected function. You can also pass the
cursor over the name of the function to activate a small information text about it.
Counter Functions
Counter Functions
Function 1760-L12 1760-L18, 1760-L20 PicoGFX
Counter Relay 16 16 32
Frequency Counter 4
High speed Counter 4
Incremental Counter 2
Operating Hours Counter 4 4 4
Time Functions
Time Functions
Function 1760-L12 1760-L18, 1760-L20 PicoGFX
7-day Time Switch 8 8 32
Year Time Switch 8 8 32
Set Cycle Time 1
Timing Relay 16 16 32
Program Operation Functions
Program Operation Functions
Function 1760-L12 1760-L18, 1760-L20 PicoGFX
Jump 8 8 32
Conditional Jump 32
Master Reset 3 3 32
Arithmetic Functions
Arithmetic Functions
Function 1760-L12 1760-L18, 1760-L20 PicoGFX
PID Controller 32
PT1-Signal Smoothing Filter 32
Value Scaling 32
Numerical Converter 32
Pulse Output
Pulse Width Modulation 2
Value Limitation 32
Memory Functions
Memory Functions
Function 1760-L12 1760-L18, 1760-L20 PicoGFX
Block Compare 32
Block Transfer 32
Boolean Operation 32
Comparator 32
Data Function Block 32
Data Multiplexer
Shift Register 32
Table Function 32
Communication Functions
Communication Functions
Function 1760-L12 1760-L18, 1760-L20 PicoGFX
Get Value from NET 32
Put Value on the NET 32
Diagnostics Alarm 9
Bit Input via the NET 32
Set Date Time via the NET 1
Bit Output via the NET 32
Serial Protocol
Text Functions
Text Functions
Function 1760-L12 1760-L18, 1760-L20 PicoGFX
Text Display 16 16
Static Text +
Message Text +
Screen Menu +
Running Text +
Rolling Text +
Value Display Functions
Value Display Functions
Function 1760-L12 1760-L18, 1760-L20 PicoGFX
Bit Display +
Message Bitmap +
Bar Graph +
Date and Time Display +
Numberical Value Display +
Timing Relay Display +
Value Entry Functions
Value Entry Functions
Function 1760-L12 1760-L18, 1760-L20 PicoGFX
Latching Button +
Button Field +
Value Entry +
Timing Relay Entry +
Date and Time Entry +
7 Day Time Switch Entry +
Year Time Switch Entry +
PROGRAMMABLE LOGIC CONTROLLERS
Pico Controllers
1760-L12 Counter Functions
Counter relay "C"
A counter relay counts events. In addition, it adds or subtracts pulses and switches when the actual value is greater than or equal to
the setpoint.
More information is provided in the function description and also in the program download. This provides a practical introduction to
the function.
PROGRAMMABLE LOGIC CONTROLLERS
Pico Controllers
1760-L18, 1760-L20 Counter Functions
Counter relay "C"
A counter relay counts events. In addition, it adds or subtracts pulses and switches when the actual value is greater than or equal to
the setpoint.
More information is provided in the function description. Or click the list of downloads. This provides a practical introduction to the
function.
PROGRAMMABLE LOGIC CONTROLLERS
Pico Controllers
PicoGFX Counter Functions
Counter relay "C"
The devices provide 32 up/down counters (Counter) C01...C32. The C.. counters count on every rising edge at the C_ input and
enables you to count events.
More information is provided in the function description. Or click the list of downloads. This provides a practical introduction to the
function.
PROGRAMMABLE LOGIC CONTROLLERS
Pico Controllers
PicoGFX Counter Functions
Frequency Counter
The control relays and visualization devices provide a range of different high-speed counter functions. These counter function blocks
can be connected directly to the digital inputs.
More information is provided in the function description. Or click the list of downloads. This provides a practical introduction to the
function.
PROGRAMMABLE LOGIC CONTROLLERS
Pico Controllers
Counter Functions
High-Speed Counter “CH” for Pico GFX
The control relays and visualization devices provide a range of different high-speed counter functions. These counter function blocks
can be connected directly to the digital inputs.
The following counter functions are possible:
CF.. Frequency counters, frequency measurement
CH.. High-speed counters, high-speed signal counting
CI.. Incremental encoders, dual-channel incremental encoder signal counting
Note:The incremental encoder is always assigned an input pair, e.g. I03 and I04!
Inputs I 01...I 04 are designed for activating high-speed counters. The following wiring requirements must be observed:
I 01 => CF 01, CH 01 or CI 01
I 02 => CF 02, CH 02 or CI 01
I 03 => CF 03, CH 03 or CI 02
I 04 => CF 04, CH 04 or CI 02
Input assignment
Caution: Each I… input on the device can only be used once by a CF, CH, CI function block. If an input Ixx is used several times,
only the high-speed counter is run that is positioned at the back in the order of processing in the function block diagram.
Example of an impermissible input assignment
I 01 = High-speed counter CH 01
I 01 = Frequency counter CF 02
I 01 = Incremental encoder channel A CI 02
All function blocks are associated with the digital input I1, but only CH01 is triggered and supplies the correct counter value.
Example of a permissible input assignment
I 01 = High-speed counter CH 01
I 02 = Frequency counter CF 02
I 03 = Incremental encoder channel A CI 02
I 04 = Incremental encoder channel B CI 02
General Information on the CH High-Speed Counter
The devices provide 4 high-speed counters (CounterH) CH01...CH 04.
These high-speed up/down counters are internally connected with the digital inputs I01...I04 and operate
independently of the cycle time.
You can enter upper and lower threshold values (setpoints) as comparison values.
The appropriate function block contact (bit output) switches according to the actual value determined.
Symbol in the function
Function block diagram
The maximum counter frequency is 5 kHz.
Only square wave signals are permissible.
The mark-to-space ratio is 1:1.
The counter wiring must observe the following digital input assignment:
I 01 counter input for counter CH 01
I 02 counter input for counter CH 02
I 03 counter input for counter CH 03
I 04 counter input for counter CH 04
Note: Avoid unforeseeable switch states. Only use each coil of a relay once in the circuit diagram. Only use a counter input for CF,
CH, CI counters once.
The Function Block and its Parameters
Description Note
Function block inputs
(DWord)
SH Upper setpoint The function block operates in the integrer range from -
2147483648…[phone]
SL Lower setpoint
SV Preset actual value
Function block output
(DWord)
QV Actual value in RUN mode
Contact
(bit output)
OF Status 1 if the actual value is greater than or equal to the
upper setpoint (Overflow)
FB Status 1 if the actual value is less than or equal to the
lower setpoint (Fall below)
CY Status 1 if the above value range is exceeded.
ZE Status 1 if the value of the QV function block output (i.e.
the counter status) is zero
Coil function
(bit input)
EN Enable for counter function block
D_ Count direction 0 = up counting, 1 = down counting
SE With a rising edge transfer the preset actual value
RE Reset the actual value to zero
Parameter set
Call Function block parameters can be viewed on the device.
enabled
Simulation
Not Hardware-dependent function block
possible
Memory Requirement
The function block requires 52 bytes of memory plus 4 bytes per function block input configured with an NU constant.
Retention
Counter relays can be run with retentive actual values. The number of counter relays can be selected in Project View in the Device
Properties dialog. The retentive actual value requires 4 bytes of memory. If a counter relay is retentive, the actual value is retained
when the operating mode is changed from RUN to STOP and when the power supply is switched off. When the device is restarted in
RUN mode, the counter relay continues with the retentively stored actual value.