Siemens SIMOCODE pro C System Manual page 382

Glossary
Expansion modules
Expansion modules are intended as optional additions for the basic units. The following
expansion modules are available:
● Digital module (DM)
● Analog module (AM)
● Ground-fault module (EM, EM+)
● Temperature module (TM)
● Multifunction module (MM).
All expansion modules are equipped with 2 system interfaces (incoming/outgoing) and
removable terminals.
F_WD_Time
Monitoring time in the fail-safe PROFIsafe option. A valid, current safety message frame
must be received from the F-CPU within this monitoring time. Otherwise, the PROFIsafe
option goes to the safe state.
Factory settings
The factory settings are used to reset all parameters of a device to the default settings to
which they were set at the factory. The factory settings can be restored using either the
"TEST / RESET" button on the basic unit or via SIMOCODE ES (TIA Portal).
Feedback circuit
A feedback circuit is used to monitor controlled actuators (e.g., relays or contactors with
positively driven contacts). The evaluation unit can only be activated if the feedback circuit is
closed.
Note:
The NC contacts of the relays to be monitored are connected in series and integrated into
the feedback circuit of the safety relay. If a contact in the enabling current path is welded, the
safety relay can no longer be activated because the feedback circuit remains in the open
position.
Field/field level
The field or field level of an automation system contains the individual sensors and
actuators, as opposed to the control level, which is located above it in the hierarchy.
Fieldbus
Industrial communication system that connects a large number of field devices such as
probes (sensors), actuators and drives to a control device.
382
System Manual, 05/2019, A5E40507475002A/RS-AD/004
SIMOCODE pro