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PLC communication is a vital component of any control system. With the many networking options available, including Ethernet and serial, PLC systems need to have adequate ports and protocols. The DirectLOGIC 405 CPUs have built-in serial ports; optional modules can provide protocol conversions or additional communication ports.
Do you need communications ports in addition to the built-in CPU communications ports to connect to an operator
interface or HMI?
Would you like to connect to a network of other AutomationDirect products,
or a MODBUS RTU or Ethernet network?
If yes, then choose between the H4-ECOM-F and H4-ECOM100 Ethernet communications modules or the D4-DCM serial data communications
Ethernet networking with the ECOM modules
The H4-ECOM-F has ST-style bayonet connectors for
10BaseFL fiber optic connections.
The H4-ECOM100 module supports 10/100BaseT and
industry standard MODBUS TCP/IP Client/Server Protocol
The ECOM modules use standard cables, hubs and repeaters,
which are available from a large number of suppliers.
A virtually unlimited number of PLCs can be connected to an
Ethernet network using ECOM modules. This is the fastest
data transfer rate we offer for your HMI or other Windows-based
Use DirectSOFT5 to program any PLC on the
network, and when monitoring your operating PLC, you will see much
faster updates with Ethernet and the ECOM module.
Choose your slot
The ECOM modules plug into any I/O slot of any local DL405 I/O base, including expansion bases when using the DL450 CPU.
The module maintains identification data, descriptive information, and communication parameters for PLC-to-PLC communications
in flash memory. Disconnect power before installing or removing any PLC module.
H4-ECOM100 MODBUS TCP/IP support
The H4-ECOM100 supports the industry standard MODBUS TCP/IP Client/Server protocol in addition to the standard IP and IPX protocols.
This allows the DL405 PLC with an H4-ECOM100 module to serve as a client (master) or as a server (slave) on a MODBUS TCP/IP Ethernet
The H4-ECOM100 can actively issue MODBUS commands to other nodes or devices on the MODBUS TCP/IP network or simply respond
to connected MODBUS TCP/IP clients.
Other DL405 Communication Modules
NOTES: New option modules may not be supported by CPUs purchased prior to the modules release.
Be sure to check for the latest firmware for your PLC. You can refer to the module specification page on our Web site for
this information, or find it in our free catalog.
Here is the direct link to the
section of our Web site where you can find the firmware revision histories, the latest files and tools required to download the
firmware into your CPU.
For further details or specifications, select the desired product category and then select the "Products" tab and click on the
product "Item Code" link, or select the "Technical Info" tab.
b>Serial networking with the D4-DCM All DL405 CPUs
support the D4-DCM Data Communications Module that can serve as a DirectNet
master/slave, DirectNet peer, or a MODBUS RTU slave.
The D4-DCM supports RS-232C and RS-422 communications. You can
program the CPU through the DCM locally, or if a PC is the RS-422
master, you can use DirectSOFT5 to program any PLC on
F4-MAS-MB - MODBUS Network Master module, MODBUS RTU
Protocol, provides block read/ write and high speed table driven
polling, up to 115,200 baud, cable not included.
F4-MAS-MBR - MODBUS Network Master module, MODBUS RTU
Protocol, provides block read/ write and high speed table driven
polling, port 1 up to 115.2 K baud, port 2 allows connection to a
leased line or radio modem up to 1,200 baud, cable not included.
F4-SLV-MB - MODBUS Network Slave module, up to 115.2
K baud, cable not included.
F4-SLV-MBR - MODBUS Network Slave module, port 1 up
to 115.2 K baud, port 2 is a built-in leased line radio modem up to
1,200 baud, cable not included
The DirectLOGIC 405 (DL405) programmable logic controller (PLC) offers the following accessories
for converting RS232 to RS422 or RS422/485 and for simple RS232C networking:
FA-ISOCON - Universal, isolated RS232C to RS422/
RS485 converter. Switch selectable for ANTE (Automatic
Network Transmitter Enable) or RTS/CTS handshaking, works with all DirectLogic
PLC families and virtually any serial device. Isolation reduces
network data problems caused by noisy environments. Power directly
from the 5 V pins on most DirectLogic CPU ports, from
a PLC base 24 VDC power supply, or from an external power supply.
Cables and connectors to most COM ports (RJ12, DB9-female,
DB25-male) provided. Integral DIN rail clamp or can be panel
mounted. Manual included with product.
F2-UNICON - RS232C to RS422 converter.
Converts RJ12 RS232C port to a DB25 male RS422 port. Powered
directly from the 5 V pins on most DirectLOGIC CPU
ports. Includes 1 ft. cable with two RJ12 6P6C plugs, and DIN rail
mounting kit. Includes manual with product. NOTE:
The F2-UNICON provides no signal isolation, so it is not
recommended for noisy industrial environments.
FA-UNICON - In-line, DB25, RS232C to RS422/ RS485
converter. Connectors provided for the D3-422-DCU and to
connect a DirectLOGIC RJ11/ RJ12 RS232C port to a DB25
female RS422/ RS485 connector. Power directly from the PLC base 24
VDC supply or an external power supply. Connection to a PC RS232 COM
port requires a custom cable. A pin 4-20 jumper is required on the
FA-UNICON for DB9. NOTE:The FA-UNICON
provides no signal isolation, so it is not recommended for noisy
FA-ISONET - Legacy product not
recommended for new designs. (Being replaced by FA-ISOCON).
Isolated RS232C to RS422/ RS485 converter. Works with all PLC
families. Helps reduce network data problems caused by noisy
environments. Powered directly from the 5 V pins on most CPU ports,
from the PLC base 24 VDC power supply, or from an external power
supply. Includes cable and DIN rail mounting kit. Includes manual
NOTE: The DL405 CPUs also support a MODBUS RTU master and slave module for connection to a MODBUS RTU network. These modules are documented in other sections.