ifm
System Manual
ecomat
mobile
SmartController (CR2500) V05
Glossary of Terms
291
Examples:
•
Automatic configuration of all slaves via
SDOs at the system start,
•
reading error messages from the object
directory.
Every SDO is monitored for a response and
repeated if the slave does not respond within
the monitoring time.
SIL
According to IEC 62061 the safety-integrity
level SIL is a classification (SIL CL 1...4) of the
safety integrity of the safety functions. It is
used for the evaluation of
electrical/electronic/programmable electronic
(E/E/EP) systems with regard to the reliability
of safety functions. The safety-related design
principles that have to be adhered to so that
the risk of a malfunction can be minimised
result from the required level.
Slave
Passive participant on the bus, only replies on
request of the
→
master. Slaves have a clearly
defined and unique
→
address in the bus.
SRDO
Safe data is exchanged via SRDOs (
S
afety-
R
elated
D
ata
O
bjects). An SRDO always
consists of two CAN messages with different
identifiers:
•
message 1 contains the original user data,
•
message 2 contains the same data which
are inverted bit by bit.
SRP/CS
S
afety-
R
elated
P
art of a
C
ontrol
S
ystem
Part of a control system that responds to
safety-related input signals and generates
safety-related output signals. The combined
safety-related parts of a control system start at
the point where the safety-related input signals
are initiated (including, for example, the
actuating cam and the roller of the position
switch) and end at the output of the power
control elements (including, for example, the
main contacts of a contactor).
SRVT
The SRVT (
S
afety-
R
elated
O
bject
V
alidation
T
ime) ensures with CANopen safety that the
time between the SRDO-message pairs is
adhered to.
Only if the redundant, inverted message has
been transmitted after the original message
within the SRVT set are the transmitted data
valid. Otherwise the receiving controller signals
a fault and will pass into the safe state
(= outputs switched off).
State, safe
The state of a machine is said to be safe when
there is no more hazard formed by it. This is
usually the case if all possible dangerous
movements are switched off and cannot start
again unexpectedly.
Symbols
Pictograms are figurative symbols which
convey information by a simplified graphic
representation.
→
Chapter What do the symbols and formats
stand for? (
→
page
)
T
Target
The target indicates the target system where
the PLC program is to run. The target contains
the files (drivers and if available specific help
files) required for programming and parameter
setting.
TCP
The
T
ransmission
C
ontrol
P
rotocol is part of
the TCP/IP protocol family. Each TCP/IP data
connection has a transmitter and a receiver.
This principle is a connection-oriented data
transmission. In the TCP/IP protocol family the
TCP as the connection-oriented protocol
assumes the task of data protection, data flow
control and takes measures in the event of
data loss.
(compare:
→
UDP)
