Step 6: Review the Programming Concepts
The DL205 provides four main approaches to solving the application program, including the
PID loop task depicted in the next figure.
• RLL diagram style programming is the best tool for solving boolean logic and general CPU register/
accumulator manipulation. It includes dozens of instructions, which will augment drums, stages
and loops.
• The DL250-1 and DL260 have four timer/event drum types, each with up to 16 steps. They offer
both time and/or event-based step transitions. Drums are best for a repetitive process based on a
single series of steps.
• Stage programming, called RLL
PLUS
, is based on state-transition diagrams. Stages divide the ladder
program into sections which correspond to the states in a flow chart of your process.
• The DL260 PID loop operation uses setup tables to configure 16 loops. The DL250-1 PID loop
operation uses setup to configure 4 loops. Features include: auto tuning, alarms, SP ramp/soak
generation and more.
Step 7: Choose the Instructions
Once you have installed the system and understand
the theory of operation, you can choose from one
of the most powerful instruction sets available.
Step 8: Understand the Maintenance and
Troubleshooting Procedures
Equipment failures can occur at any time. Switches
fail, batteries need to be replaced, etc. In most
cases, the majority of the troubleshooting and
maintenance time is spent trying to locate the
problem. The DL205 system has many built-in
features that help you quickly identify problems.
Refer to Chapter 9 for diagnostics.
DL205 User Manual, 4th Edition, Rev. B
1–14
Chapter 1: Getting Started
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A
B
C
D
Standard RLL Programming
(see Chapter 5)
X0
LDD
V1076
CMPD
K309482
SP62
OUT
Y0
Timer/Event Drum Sequencer
(see Chapter 6)
Push–UP
UP
Push–
DOWN
DOWN
LOWER
RAISE
LIGHT
Stage Programming
(see Chapter 7)
PID Loop Operation
(see Chapter 8)
PV
PID Process
SP
k?
+
–
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