154 Rockwell Automation Publication ICSTT-RM447M-EN-P - July 2019
Glossary
B
backplane clip A sprung, plastic device to holding together two adjacent AADvance base
units. Part number 9904. Used in pairs.
base unit One of two designs making the supporting parts of an AADvance controller.
See 'I/O base unit' and 'processor base unit'.
binding A relationship between two variables in different AADvance controllers. One
variable is a producer and the other is a consumer. The system updates the value
in the consumer to match the data in the producer. See ‘SNCP protocol’.
black channel A path for communications data which does not maintain the integrity of the
data transferred over it. Measures to find and compensate for errors introduced
by the black channel are implemented by software or hardware (or both) in the
safety critical sender and receiver.
blanking cover A plastic moulding to hide an empty slot in an AADvance controller base unit.
Boolean A type of variable that can only accept only the values 'true' and 'false'.
BPCS Basic process control system. A system responding to input signals and
generating output signals causing a process and its related equipment to operate
in a desired way, having no safety instrumented functions with a safety integrity
level of 1 or higher. See IEC 61511 and ANSI/ISA—84.00.01—2004 Part 1
(IEC 61511-1 Mod) for a formal definition. Equivalent to the Process Control
System (PCS) specified by IEC 61508.
breakdown voltage The maximum voltage (AC or DC) that can be continuously applied between
isolated circuits without failure of the insulation.
BS EN 54 A standard for fire detection and fire alarm systems.
BS EN 60204 A standard for the electrical equipment of machines, which promotes the
safety of persons and property, consistency of control response and to make
maintenance easy.
bus A group of conductors for related data. Typically allocated to address, data and
control functions in a microprocessor-based system.
bus arbitration A mechanism for deciding which device has control of a bus.
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