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Glossary
F
Fast counters
A function block that provides for faster up/down counting than available with the
Counters function block. A Fast Counter can count up to a rate of 5 KHz.
FIFO
First In, First Out. A function block used for queue operations.
Firmware
executive
The Firmware Executive is the operating system that executes your applications and
manages controller operation.
Forcing
Intentionally setting controller inputs and outputs to 0 or 1 values even if the actual
values are different. Used for debugging while animating a program.
Frame
A group of bits which form a discrete block of information. Frames contain network
control information or data. The size and composition of a frame is determined by
the network technology being used.
Framing types
Two common framing types are Ethernet II and IEEE 802.3.
Function block
A program unit of inputs and variables organized to calculate values for outputs
based on a defined function such as a timer or a counter.
G
Gateway
A device which connects networks with dissimilar network architectures and which
operates at the Application Layer. This term may refer to a router.
Grafcet
Grafcet is used to represent the functioning of a sequential operation in a structured
and graphic form.
This is an analytical method that divides any sequential control system into a series
of steps, with which actions, transitions, and conditions are associated.
H
Host
A node on a network.
Hub
A device which connects a series of flexible and centralized modules to create a
network.
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