Omron SYSMAC C200HW-PCS01-EV1, Operation Manual

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Glossary
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electrical noise Random variations of one or more electrical characteristics such as voltage, cur-
rent, and data, which might interfere with the normal operation of a device.
EPROM Erasable programmable read-only memory; a type of ROM in which stored data
can be erased, by ultraviolet light or other means, and reprogrammed.
error code A numeric code generated to indicate that an error exists, and something about
the nature of the error. Some error codes are generated by the system; others
are defined in the program by the operator.
Ethernet A hardware local area networking system used for communications.
Ethernet address A physical address assigned to Ethernet hardware.
Ethernet card A card which provides Ethernet capability to the Unit or hardware in which it is
installed.
even parity A communication setting that adjusts the number of ON bits so that it is always
even. See parity.
event processing Processing that is performed in response to an event, e.g., an interrupt signal.
FA Factory automation.
fatal error An error that stops PC operation and requires correction before operation can
continue.
FCS See frame checksum.
FINS Factory Interface Network Service: A protocol that transfers messages between
PCs on any of various OMRON FA networks. Also see CV-mode.
flag A dedicated bit in memory that is set by the system to indicate some type of oper-
ating status. Some flags, such as the carry flag, can also be set by the operator
or via the program.
frame checksum The results of exclusive ORing all data within a specified calculation range. The
frame checksum can be calculated on both the sending and receiving end of a
data transfer to confirm that data was transmitted correctly.
FTP File Transfer Protocol: Transfers data in file units to and from Memory Cards.
function code A number assigned to a ladder-diagram instruction to input and execute it.
header The first portion of a command or response in a communications packet. The
header specifies basic information that determines the purpose of the packet.
header code A code in an instruction that specifies what the instruction is to do.
hexadecimal A number system where all numbers are expressed to the base 16. In a PC all
data is ultimately stored in binary form, however, displays and inputs on Pro-
gramming Devices are often expressed in hexadecimal to simplify operation.
Each group of four binary bits is numerically equivalent to one hexadecimal digit.
host interface An interface that allows communications with a host computer.
host number The portion of the IP address used to differentiate nodes on an Ethernet net-
work.