TM 5-3895-374-24-1
RTB -Removable Terminal Block
Signal Delay- For inputs, the response time required to transmit the circuit status from the
field wiring to the digital logic For outputs, the time required to transmit the circuit status from
digital logic to the output wining
Sinking- A term used to describe current flow between an 1/0 device and SLC I/O circuit-
typically, a sinking device or circuit provides a path to ground, low, or negative side of power
supply
Sinking/Sourcing- Describes a current signal flow relationship between field input and
output devices In a control system and their power supply. Sourcing I/O modules supply (or
source) current to sinking field devices. Sinking I/O modules receive (or sink) current from
sourcing field devices
Sourcing-A term used to describe current flow between an I/O device and SLC 1/0 circuit-
typically, a sourcing device or circuit provides a path to the source, high, or positive side of
power supply
Surge Current Per Point- The maximum amplitude arid duration (pulse) of current allowed
for a given period of time and temperature
Surge Suppressor-A device used to absorb voltage transients created by energizing an
inductive load to reduce electrical noise or to protect the output circuit For example, an R-C
network, MOV (metal oxide varistor) or diode
Token- The logical right to initiate communications In a multi-master network a single token
is passed between Initiators to make sure two nodes do not transmit at the same time
UVPROM-An Ultra-Violet light erasable Programmable Read Only Memory module used to
back-up, store, or transfer SLC 500 programs. The SLC 5/01 and 5/02 can only read from a
UVPROM. An external PROM programmer is used to program (write to) the device
Voltage Category- The nominal voltage used to describe the module
Watts Per Point- The maximum heat dissipation that can occur In each field wiring point
when energized
(page 3-466)
Glossary
