Bradley Smoker PLC-5 user manual Link Design

9-2Communicating with Devices on a DH+ Link

	Devices that You Can Connect
	Catalog		Required
Product	Number	Application	Cables
ControlLogix Data Highway Plus Remote I/O	1756-DHRIO	Allows communication between PLC-5 controllers over	1770-CD
Interface Module		different networks, such as Data Highway Plus,
		ControlNet and Ethernet
Data Highway or Data Highway Plus	1770-KF2	Connects an asynchronous (RS-232C) device to a Data	1770-CD
(RS-232C or RS-422-A) Interface Module		Highway or DH+ network
Data Highway / Data Highway Plus	1771-KRF	Media bridge connecting as many as 18 Data Highway
on Broadband		networks to communicate over a facility-wide broadband
		cable system
Communication Interface Card	1784-KL	Connects the T47 Portable Programming Terminal to DH+	1784-CP
			1784-CP2
Data Highway Plus XT/AT Interface Module	1784-KT	Connects IBM XT or AT compatible computers to DH+
			1784-CP3
Data Highway Plus PS/2 Interface Module	1784-KT2	Connects IBM PS/2 compatible computers to DH+	1784-CP5
			1784-CP6
Data Highway Plus to Data Highway	1785-KA	Connects a Data Highway network to a DH+ network	1770-CD
Interface Module
DH+ to DH-485 Interface Module	1785-KA5	Connects a DH-485 link to a DH+ link.
Data Highway Plus RS-232C Interface	1785-KE	Connects an asynchronous (RS-232C) device and DH+
Module
PCMCIA Card	1785-PCMK	Connects PCMCIA Bus notebook computers to DH+	1784-PCM5

Link Design

Trunk line/drop line considerations:

When using a trunk line/drop line configuration, use 1770-SC station connectors and follow these cable-length guidelines:

•trunk line-cable length – depends on the communication rate of the link

•drop-cable length – 30.4 m (100 cable-ft)

For more information about designing trunk line/drop line configurations, see the Data Highway Plus/Data Highway II/Data Highway-485 Cable Installation Manual, publication 1770-6.2.2.

Specify 1770-CD (Belden 9463) cable. Connect a DH+ network using a daisy chain or trunk line/drop line configuration.

Verify that your system’s design plans specify cable lengths within allowable measurements.

	The maximum cable length for DH+ depends on the
IMPORTANT
	transmission rate. Configure all devices on a DH+ link to
	communicate at the same transmission rate.

For daisy chain configurations, use this table to determine the total cable length you can use.

A DH+ link using this	Cannot exceed this
communication rate	cable length
57.6 kbps	3,048 m (10,000 ft)
115.2 kbps	1,524 m (5,000 ft)
230.4 kbps	762 m (2,500 ft)

Publication 1785-UM012D-EN-P - July 2005