Glossary GL–3
Publication
1747-6.2
Initiator — A node on the DH-485 network capable of acting as a
master. When an initiator has the token it can send messages and
request replies from any node on the DH-485 network. A personal
computer running your programming software is an initiator on the
data link. The SLC 5/02, SLC 5/03, and SLC 5/04 processors can
also be initiators.
Input Device — A device, such as a push button or a switch, that
supplies signals through input circuits to a programmable controller.
Inrush Current — The temporary surge current produced when a
device or circuit is initially energized.
I/O — Inputs and Outputs
IP Address — A 32-bit address assigned to hosts that want to
participate in a TCP/IP internet. IP addresses are the abstraction of
physical hardware addresses, with a network and host partition
which makes routing efficient.
Isolated Link Coupler — The link coupler provides an electrically
isolated network connection for an SLC 500 controller (processor or
programming station). The link couplers connect the daisy-chained
DH-485 communication cable.
LED — Light Emitting Diode. Used as status indicator for
processor functions and inputs and outputs.
Manual — Typically an acoustically coupled type of modem. The
connection is established by a person on each end of the phone line.
They then insert the handsets into an acoustic coupler to complete
the connection.
Maximum Watts — The maximum amount of heat that the module
generates with field power present.
Minimum Load Current — The lowest amount of current the
output is designed to operate at. Operating at or below this value is
not reliable.
Minimum Watts — The amount of heat dissipation that can occur
when there is no field power present.
Multi-master network — A network in which more than one node
has the ability to initiate communications and initialize the link.
M0/M1 File Transfer — A M1/M0 file transfer is a method of
moving large amounts of data between a SLC 500 processor and its
scanner. It transfers files containing a maximum of 256 words and
may take more than one SLC program scan to complete.
AB PLCs
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