Example Programs

We supply these programs as examples of how to apply the various instructions in our PLC’s. Please try to use these examples in their original form before modifying them for your particular application. We have had many calls claiming that the examples don't work and found that a mistake had been made when the example was re-entered by hand. The examples posted here have been run on equipment in our lab. If you are having difficulty with one of the examples check the following:

Have changes been made and are they correct?
Look at the title page for any special instructions.
Is the example the only thing executing in the CPU and has the CPU gone from PROGRAM mode to RUN mode to allow the first scan logic to run?
Does the CPU type and I/O match the example?

If you still have problems give us a call.

Thank you - The AutomationDirect Technical Support Team

THE INFORMATION PROVIDED IN AUTOMATIONDIRECT TECHNOTES IS PROVIDED "AS IS" WITHOUT A GUARANTEE OF ANY KIND. These documents are provided by our technical support department to assist others. We do not guarantee that the data is suitable for your particular application, nor do we assume any responsibility for them in your application.

Please note: additional sample programs for C-more Operator Interface panels can be found at the c-more.automationdirect.com site.

Instructions: The program you will download depends on which CPU you have. Find your CPU in the colored columns on the right, and click the WinZIP icon to download the right example program. The absence of an icon for a given CPU means that the example is not applicable for or will not work with that CPU.

General Examples		05	06	105	205	305	350	405
EP-MISC-001	Simple program that adjusts the PLC clock to account for Daylight Saving Time. Can be used in DL250, 350, 450 and DL05 if the optional memory cartridge is installed.
EP-MISC-002	This file shows how the square root of a value between 1 and 9999 could be calculated. The resulting value has 2 implied decimal points. The square root is determined by using an iterative approximation, and therefore this algorithm requires a long time to execute.
EP-MISC-004	This example shows how to convert the current value of a timer or counter so that it appears to count down instead of up. This is useful for displays on an operator interface or for relational contacts to trigger an action at a low limit.
EP-MISC-005	This project uses two buttons pushed together for three seconds to latch an output.
EP-MISC-006	This is a simple example of how to use pointers.
EP-MISC-007	This program utilizes a pointer routine to store the accumulated time of T0 into successive double word V-memory locations beginning at V2000. Each time C0 changes from OFF to ON the accumulated time is loaded into the current memory location pointed to then the pointer location is incremented by 2 for a double word. This program is coded for the D2-250 Using Pointers it shows how to increment and move through a series of registers.
EP-MISC-008	This project will create a table of values generated by measuring the times an input is energized.
EP-MISC-009	This program shows how to implement a push-down stack in ladder using the MOV instruction.
EP-MISC-010	DL450 PLC Only. This program calculates the Standard Deviation on a Table of 10 BCD Double Words. See readme.txt inside the ZIP file for more details
EP-MISC-011	Calibrating analog I/O with a non-zero starting point
EP-MISC-012	Off-Delay Timer
EP-MISC-013	Adding two tables using consecutive V-Memory locations with pointers
EP-MISC-014	How to create a FIFO (First In First Out) Stack
EP-MISC-017	Creating a Non-linear function with look-up table

Communications		05	06	105	205	305	350	405
EP-COM-001	Example of how to configure port 2's communication parameters.
EP-COM-002	This program shows how communication errors can be detected when using the RX and WX instructions.
EP-COM-003	Networking multiple GS drives with the standard instruction set in the DL05 and D2-250
EP-COM-004	Networking multiple GS drives with the new Modbus instruction set in the DL06 and D2-260
EP-COM-005	Master project: This project contains simple logic for reading the inputs from an DL05 / 06 slave and placing their status in C0-C17 in the master. It also writes C20-C37 to the outputs on the slave. Slave project: This project can be used in conjunction with the master project to setup the slave to turn off its outputs if the master PLC stops communicating with it.
EP-COM-006	An example program for the D2-250 CPU and the ERM to communicate with an HA-EDRV2 and a SJ100 Hitachi drive
EP-COM-008	Ladder example for receiving ASCII input to an 06 and 260. Typical application would be a bar code scanner or weight scale that sends data to the PLC and does not require any communication from the PLC. Note: This example is written for a 260 processor. If you do not have 205 programming support, a PDF copy of the program is included in the zip file.

Counters		05	06	105	205	305	350	405
EP-CT-001	Example of how to calculate RPM for a device connected to the High Speed Counter inputs on the 105 CPU.
EP-CT-002	This app shows how to combine Straight Velocity and Accel/Decel profiles in mode 30.
EP-CT-003	This file that contains two projects for 105 mode 30 pulse output; one for trapezoidal profile and one for registration. These projects are enhancements of the examples show in the manual on pages 3-31 and 3-34 in that they provide logic for using a momentary start pushbutton instead of a maintained button.
EP-CT-004	CTRIO programming examples for Pulse Output functions
EP-CT-005	Making both quadrature counting channels of a CTRIO retentive on power cycle
EP-CT-006	Example program for making 2 CTRIO modules in an 06 retentive on power cycle

Operator Interface		05	06	105	205	305	350	405
EP-OP-001	Example of how to detect that the Optimation panel is no longer communicating from within the CPU.
EP-OP-002	This app note shows how the date & time can be changed using the OP-1510 panel. It only works in the 250, 350, 440 & 450 CPU with the date & time instructions.
EP-EZ-001	This example has an EZ Touch project and a DirectSoft32 Ladder program that shows how to set the PLC Clock for the (250,350,440,450 and 05(with optional D0-01MC module installed)) using the DATE and TIME instructions.
EP-EZ-002	These two files are an example for the EZ-TEXT panels and DL205 PLC family that gives several demonstrations of how to use the panel for viewing and changing messages and data, for emergency messages controlled by the PLC, and how to configure the options on the TEXT panel.