GE EX2100 - Manual (Page 104)

ii •••• Glossary of Terms GEH-6632 EX2100 User’s Guide
block
Instruction blocks contain basic control functions, which are connected together
during configuration to form the required machine or process control. Blocks can
perform math computations, sequencing, or regulator (continuous) control.
board
Printed wiring board or card.
bus
Upper bar for power transfer, also an electrical path for transmitting and receiving
data.
bumpless
No disruption to the exciter when transferring control.
byte
A group of binary digits (bits); a measure of data flow when bytes per second.
CMOS
Complementary metal-oxide semiconductor.
COM port
Serial controller communication ports (two). COM1 is reserved for diagnostic
information and the Serial Loader. COM2 is used for I/O communication
configure
To select specific options, either by setting the location of hardware jumpers or
loading software parameters into memory.
crowbar
The crowbar limits the high negative voltages that can be induced into the PCM
during a pole slip (loss of synchronism) event. It includes a discharge resistor, and is
self firing.
CT
Current Transformer, used to measure current in an ac power cable.
DACA
Ac to dc converter for power supply, produces 125 V dc.