Festo CTEU-CO Manual, Functions And Maintenance page 12

Installation
Term/abbreviation
Bus nodes
COB-ID
DCF
DIL switches
EDS
Fail state
F0
h
Heartbeat
Hold last state
I/Os
Load voltage
Node guarding
Node ID
OB
Object Directory
O, I
X
The following product and fieldbus-specific terms and abbre-
viations are used in this manual:
Meaning
create the connection to certain field busses/networks, pass on control
signals to the connected devices/modules and monitor their functioning.
Communication Object Identifiers consist of the function code and
address of the activated field bus slave (Node ID).
Device Configuration File = these files contain additional project data
which extends beyond EDS content/scope.
Dual-In-Line switches usually consist of several switching elements which
can be used to implement hardware settings.
Electronic Data Sheets include product-specific data about the bus node.
This is a function which automatically activates the "Hold last state"
function in the event of an abortion of the network connection, and it is
also designated "fail safe" in some cases.
Hexadecimal numbers are marked by a low-set "h".
The bus node sends a telegram cyclically to the network which can be
monitored by any station, compare with node guarding.
defines the status which outputs/valves are to assume after field bus
and/or communication errors
Digital inputs and outputs
includes the power supply for connected devices and (digital) outputs,
e. g. solenoid coils of valves
Cyclic monitoring of the fieldbus station by the master controller by
requesting a response within a specified time period.
Address of the fieldbus station
Output byte
makes all important slave parameters accessible in a standardised
manner
Digital output, digital input
Festo P.BE-CTEU-CO-OP+MAINT-EN en 1101NH