28 HX7+ ASD Installation and Operation Manual
I/O and Control
The HX7+ ASD can be controlled by several input types and combinations thereof, as well as operate 
within a wide range of output frequency and voltage levels. This section discusses the ASD control 
methods and supported I/O functions.
The Terminal Board supports discrete and analog I/O functions and is shown in Figure 8 on pg. 32. 
Table 6 lists the names and the default settings of the input and output terminals of the Terminal Board. 
See the section titled Terminal Descriptions on pg. 29 for an expanded description of each terminal.
Note: Set the Command Mode to Terminal Board to use the input control lines of the 
Terminal Board for command input (Program Fundamental Standard Mode 
Selection  Command Mode  Terminal Board). Output lines of the Terminal 
Board need not be selected to enable the output. However, output lines may be set to 
a user-selected function.
Figure 20 on pg. 38 shows the typical connection diagram for the HX7+ ASD system.
Table 6. Terminal Board Terminal Names and Functions.
Default Term. 
Setting
Input/Output
Default Function
(also see 
Terminal Descriptions on pg. 29)
Circuit Config.
ST
Discrete Input
Connect to CC 
to activate 
(Sink mode)
Sink/Source 
Switching 
applies to 
discrete input 
terminals only.
Standby — Multifunctional programmable discrete input. Activation 
required for normal ASD operation.
Figure 10 on pg. 36.
RES
Reset — Multifunctional programmable discrete input. Resets a faulted 
ASD.
F
Forward — Multifunctional programmable discrete input.
R
Reverse — Multifunctional programmable discrete input.
S1
Preset Speed 1 — Multifunctional programmable discrete input.
S2
Preset Speed 2 — Multifunctional programmable discrete input.
S3
Preset Speed 3 — Multifunctional programmable discrete input.
S4
Emergency Off — Multifunctional programmable discrete input.
RR
Analog Input
RR — Multifunction programmable analog input
(0.0 to 10 volt input — 0 to 80 Hz output).
Figure 11 on pg. 36.
RX
RX — Multifunctional programmable analog input 
(-10 to +10 VDC input — -80 to +80 Hz output).
Figure 12 on pg. 36
II
II — Multifunctional programmable analog input (4 [0] to 20 mADC 
input — 0 to 80 Hz output).
Figure 13 on pg. 36.
VI
VI — Multifunctional programmable analog input
(0 to 10 VDC input — 0 to 80 Hz output).
AM
Analog Output
Produces an output current that is proportional to the magnitude of the 
function assigned to this terminal.
Figure 18 on pg. 36
FM
OUT1 (C-A)
Switched 
Output
Low Frequency — Programmable contact (N.O.).
Figure 16 on pg. 36.
OUT2 (C-A)
Reach Frequency — Programmable contact (N.O.).
FLA
Fault relay (N.O.).
Figure 19 on pg. 36.
FLB
Fault relay (N.C.).
FLC
Fault relay (Common).
FP
Pulsed Output
Frequency Pulse — an output pulse train that has a frequency which is 
based on the output frequency of the ASD.
Figure 17 on pg. 36.
P24
DC Output
24 VDC @ 50 mA output. Figure 14 on pg. 36.
PP
PP — 10.0 VDC voltage source for the external potentiometer. Figure 15 on pg. 36.
CC
— Return for analog and discrete input terminals.
DO NOT connect to 
Earth Gnd.