采用硬件和软件手段来接收外部信号转换器发出的信号，并将这些信号按要求转变为数字模式。继电器可接受的直流输入量的电流范围为-1到+20毫安，与常见的信号转换器输出量的范围相匹配。在整个范围内，所有输入量被认为是线性的。
Reliance Electric PC Board Calibration 0-48652 048652
Reliance Electric PC Board Calibration 0-48652 048652
Reliance Electric Circuit Board 0-52838 052838
Reliance Electric Circuit Board 0-52838 052838
Reliance Electric Circuit Board 0-52837 052837
Reliance Electric 0-57400-1 115V AC/DC Input 0574001
RELIANCE ELECTRIC 0-51862-1 USAB DRIVE MODULE
Reliance Electric 0 51831 1 / 051831123d 10h 57m
RELIANCE ELECTRIC REMOTE OPERATOR BUFFER 0-57005 057005 705354-17A
Reliance Electric 0-51831-1 CVTB Module PCB
Reliance Electric Drive Module Card Board, # 0-52837,
Reliance Electric 0-52840-44A CCC Drive Module
Reliance Electric 0-52876-1 Drive Module Circuit Board B16 (791)
