AutomationDirect DL205 User Manual

DL205 User Manual, 4th Edition, Rev. D
3-22
Chapter 3: CPU Specifications and Operations
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Program Mode Operation
In Program Mode the CPU does not execute
the application program or update the output
modules. The primary use for Program Mode
is to enter or change an application program.
You also use the program mode to set up
CPU parameters, such as the network address,
retentive memory areas, etc.
You can use the mode switch on the DL250–1 and DL260 CPUs to select Program Mode
operation. Or, with the switch in TERM position, you can use a programming device such as
the Handheld Programmer to place the CPU in Program Mode.
Run Mode Operation
In Run Mode, the CPU executes the application
program, does PID calculations for configured
PID loops (DL250-1/DL260), and updates the
I/O system. You can perform many operations
during Run Mode. Some of these include:
• Monitor and change I/O point status
• Update timer/counter preset values
• Update Variable memory locations
Run Mode operation can be divided into several
key areas. It is very important you understand
how each of these areas of execution can affect
the results of your application program solutions.
You can use the mode switch to select Run Mode
operation (DL240, DL250–1 and DL260).
Or, with the mode switch in TERM position,
you can use a programming device, such as the
Handheld Programmer, to place the CPU in
Run Mode.
You can also edit the program during Run Mode.
The Run Mode Edits are not “bumpless.”
Instead, the CPU maintains the outputs in
their last state while it accepts the new program information. If an error is found in the new
program, then the CPU will turn all the outputs off and enter the Program Mode.
WARNING: Only authorized personnel fully familiar with all aspects of the application should make
changes to the program. Changes during Run Mode become effective immediately. Make sure you
thoroughly consider the impact of any changes to minimize the risk of personal injury or damage to
equipment.
Download Program
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Read Inputs
Read Inputs from Specialty I/O
Solve the Application Program
Write Outputs
Diagnostics
Service Peripherals, Force I/O
Write Outputs to Specialty I/O
CPU Bus Communication
Update Clock, Special Relays
Solve PID Equations (DL250-1/DL260)

AutomationDirect DL205 Specifications

General

Brand	AutomationDirect
Model	DL205
Category	Controller
Language	English