ifm
System Manual
ecomat
mobile
PDM360NG (CR1080, CR1081, CR9042) Target V01
2011-07-28
Glossary of Terms
455
RTC
RTC =
R
eal
T
ime
C
lock
Provides (batter-backed) the current date and
time. Frequent use for the storage of error
message protocols.
rw
RW = read/ write
Bidirectional data transmission: Data can be
read and also changed.
S
SAE J1939
The network protocol SAE J1939 describes the
communication on a CAN bus in commercial
vehicles for transmission of diagnosis data
(e.g.engine speed, temperature) and control
information.
CiA DS 402
Standard: "Recommended Practice for a Serial
Control and Communications Vehicle Network"
Part 2: "Agricultural and Forestry Off-Road
Machinery Control and Communication
Network"
Part 3: "On Board Diagnostics Implementation
Guide"
Part 5: "Marine Stern Drive and Inboard Spark-
Ignition Engine On-Board Diagnostics
Implementation Guide"
Part 11: "Physical Layer – 250 kBits/s,
Shielded Twisted Pair"
Part 13: "Off-Board Diagnostic Connector"
Part 15: "Reduced Physical Layer, 250 kBits/s,
Un-Shielded Twisted Pair (UTP)"
Part 21: "Data Link Layer"
Part 31: "Network Layer"
Part 71: "Vehicle Application Layer"
Part 73: "Application Layer – Diagnostics"
Part 81: "Network Management Protocol"
Safety function
Function of the machine whose failure can
result in an immediate increase of the risk(s).
The designer of such a machine therefore has
to:
- safely prevent a failure of the safety function,
- reliably detect a failure of the safety function
in time,
- bring the machine into a safe state in time in
the event of a failure of the safety function.
Safety-standard types
The safety standards in the field of machines
are structured as below:
Type-A standards (basic safety standards)
giving basic concepts, principles for design,
and general aspects that can be applied to all
machinery. Examples: basic terminology,
methodology (ISO 12100-1), technical
principles (ISO 12100-2), risk assessment
(ISO 14121), ...
Type-B standards (generic safety standards)
dealing with one safety aspect or one type of
safeguard that can be used across a wide
range of machinery.
Type-B1 standards on particular safety
aspects. Examples: safety distances
(EN 294), hand/arm speeds (EN 999),
safety-related parts of control systems
(ISO 13849), temperatures, noise, ...
Type-B2 standards on safeguards.
Examples: emergency stop circuits
((ISO 13850), two-hand controls,
interlocking devices or electro-sensitive
protective equipment (ISO 61496), ...
Type-C standards (machine safety standards)
dealing with detailed safety requirements for a
particular machine or group of machines.
SCT
In CANopen safety the
S
afeguard
C
ycle
T
ime
(SCT) monitors the correct function of the
periodic transmission (data refresh) of the
SRDOs. The data must have been repeated
within the set time to be valid. Otherwise the
receiving controller signals a fault and passes
into the safe state (= outputs switched off).
