DL205 User Manual, 4th Edition, Rev. B
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Chapter 1: Getting Started
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DL205 System Components
The DL205 family is a versatile product line that provides a wide variety of features in an
extremely compact package. The CPUs are small, but offer many instructions normally only
found in larger, more expensive systems. The modular design also offers more flexibility in the
fast moving industry of control systems. The following is a summary of the major DL205
system components.
CPUs
There are four feature-enhanced CPUs in this product line, the DL230, DL240, DL250–1
and DL260. All CPUs include built-in communication ports. Each CPU offers a large
amount of program memory, a substantial instruction set and advanced diagnostics. The
DL250–1 features drum timers, floating–point math, 4 built-in PID loops with automatic
tuning and 2 bases of local expansion capability.
The DL260 features ASCII IN/OUT and extended MODBUS communications, table and
trigonometric instructions, 16 PID loops with autotuning and up to 4 bases of local
expansion. Details of these CPU features and more are covered in Chapter 3, CPU
Specifications and Operation.
Bases
Four base sizes are available: 3, 4, 6 and 9 slot. The DL205 PLCs use bases that can be
expanded. The part numbers for these bases end with –1. These bases have a connector for
local expansion located on the right end of the base. They can serve in local, local expansion
and remote I/O configurations. All bases include a built-in power supply. The bases with the
–1 suffix can replace existing bases without a suffix if expansion is required.
I/O Configuration
The DL230 and DL240 CPUs can support up to 256 local I/O points. The DL250–1 can
support up to 768 local I/O points with up to two expansion bases. The DL260 can support
up to 1280 local I/O points with up to four expansion bases. These points can be assigned as
input or output points. The DL240, DL250–1 and DL260 systems can also be expanded by
adding remote I/O points. The DL250–1 and DL260 provide a built–in master for remote
I/O networks. The I/O configurations are explained in Chapter 4, System Design and
Configuration. I/O Modules
I/O Modules
The DL205 has some of the most powerful modules in the industry. A complete range of
discrete modules which support 24 VDC, 110/220 VAC and up to 10A relay outputs (subject
to derating) are offered. The analog modules provide 12 and 16 bit resolution and several
selections of input and output signal ranges (including bipolar). Several specialty and
communications modules are also available.
