Symbols/Icons And Writing Style/Spelling Standard Used - Leuze electronic MSI 400 Series Manual

Term
MSI 4xx
MSI 430
PLC
Stuck-at high
Stuck-at low
T→O
TCP
Test pulses or scan gaps
Test pulse error
TX
UCMM
UDINT
UDP
UDT
UINT
USINT
1.6

Symbols/icons and writing style/spelling standard used

NOTICE
i
These are notes that provide you with information regarding particularities of a device or a soft-
ware function.
Leuze electronic
Explanation
Safety controller consisting of a controller module of the MSI 400 product
family, as well as optionally connectable expansion gateways and I/O mod-
ules.
Controller module, which is equipped with safety inputs and outputs and
gateway functions, amongst other things
Programmable Logic Controller
( PLC)
Stuck-at high is an error in which the input or output signal gets stuck at On.
The causes for a Stuck-at high can be short-circuits to other input and output
lines, often called cross-references, or defective switching elements. Stuck-at
high errors are discovered through plausibility tests, such as sequence errors
in two-channel input circuits or using test pulses in input and output circuits.
Stuck-at low is an error in which the input or output signal gets stuck at Off.
The causes of a stuck-at low can be line interruptions in input circuits or de-
fect switching elements. Stuck-at low errors are discovered through plausibil-
ity tests and usually do not require immediate error recognition.
Target to Originator
Transmission Control Protocol, Internet standard protocol for the transport
layer specified in RFC 793
Test pulses or scan gaps are brief switch-offs / interruptions in input and out-
put circuits, which are generated in a targeted manner to detect stuck-at high
errors quickly. Test pulses check the switch-off ability of switching elements
during operation on an almost continuous basis.
Test pulse errors are undetected test pulses, which lead to a negative test
result and thus switch-off of the affected safety circuits.
Transmit / Send
Unconnected Message Manager
Unsigned double integer = 4 Bytes = 2 Words
Data type specified for CIP applications
User Datagram Protocol, Internet standard protocol for the transport layer
specified in RFC 793
User Defined Type
Unsigned double integer = 2 Bytes = 1 Word
Data type specified for CIP applications
Data type specified for CIP applications, which stands for 1 byte without a
plus/minus symbol
MSI 400
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