SAFETY MANUAL - Tuv-fs.com

SAFETY MANUAL
similar to the simple textual PLC’s language.
Industrial
Processor
Input Module
I/O
High performance processor for use in non
safety-related applications which can be used in
a simplex or dual-redundant configuration.
Interface that converts input signals from
external devices into signals that the control
system can utilise.
Input/Output conditioning circuits (as distinct
from the central processing).
I/O Driver
Essential software to allow the IEC1131
TOOLSET to configure and program unique
types of TMR system I/O interfaces.
LD Ladder Diagram. An IEC1131 language
composed of contact symbols representing
logical equations and simple actions. The
main function of the ladder diagram is to
control outputs based on input conditions.
MMI Man Machine Interface. The operator’s
window to monitoring and keys, knobs,
switches, Graphical User Interface of the
Operator Workstation, etc. for making
adjustments in the process.
Modbus An industry standard communications
protocol developed by Modicon. Used to
communicate with external devices such as
distributed control systems (DCSs) or operator
interfaces.
M-oo-N
m-out-of-n. See Voting System
Module An electronic (generally pluggable) subsystem.
MORSE
Output Module
Peer-to-Peer
Communications
PCM
Protocol
PSU
Method for Object Reuse in Safety-critical
Environments. Programming and
configuration software tool for the Fastflex
range of Remote I/O.
Interface that converts output signals from the
control system into signals that can actuate
external devices.
Allows two or more TMR Controllers to
communicate with each other.
PCI Mezzanine Card
A set of rules governing data flow in a
communication system. The protocol governs
such matters as the way a message is
addressed and routed, how often it is sent,
how to recover from transmission errors and
how much information is to be sent.
Power Supply Unit.
Doc No P8094
Issue 14 September 2003
Page xii