Need help selecting a PLC family? Use our selection tool to configure and order.
Programmable logic controllers have to reliably execute the numerous logic operations and communication requests that automated facilities/machines require. Not intended for new system development, the DirectLOGIC 305 controller series has a large installed base that will continue to be served while components are still available.
Stay ahead by building on the past with a proven
The DirectLOGIC DL305 PLC series is a small modular PLC that has been marketed by various name-brand PLC manufacturers for over 30 years.
This Koyo design revolutionized the small PLC market, and is still a good performer and a great value.
Over 3,000,000 Koyo DL305 PLC modules have been sold, which shows that these industrial PLCs are extremely reliable and well-suited for
many industrial automation applications.
Three standard CPUs to choose from, including the D3-350 CPU
with PID control and two communication ports
Specialty CPUs to convert a DL305 system into an RTU for
Optomux, Pamux, or to allow BASIC programming for custom
Five, eight and 10-slot bases
110/ 220 VAC or 24 VDC power supply
AC, DC inputs
AC, DC, and relay outputs
Eight or 12-bit analog input/output
Specialty modules such as ASCII/ BASIC module, high-speed
counter, and communication interface module (for use with D3-330 and
The D3-350 CPU has a killer instruction set (compatible with the DL405, DL205, DL105, and DL05 PLC families) and
some super practical communications.
The D3-350 CPU uses a simplified I/O addressing method, and can access up
to twice as much local I/O as any other DL305 configuration (when installed in a system with -1 bases).
Real-time calendar/ clock and historical error logging
Trigger events in logic or time-and-date stamp error
Four super-easy PID loops with 'auto-tune' allow the CPU to
automatically determine the near-optimum loop settings
Automatic loop scheduling reduces logic required to operate
Fill-in-the-blank chart for alarms and ramp/ soak
Programming software includes loop tune screen with trending
Two communication ports include built-in remote I/O master
for long-distance I/O expansion