4.3 Connecting the HWBB Function Signal
4.3.1 Safety Function Connector (CN8) Pin Arrangement
4-8
4.3
Connecting the HWBB Function Signal
This section describes the wiring that is required to use the HWBB function.
Refer to the following chapter for details on the HWBB function.
4.3.1
Safety Function Connector (CN8) Pin Arrangement
*
Do not use these pins because they are connected to internal circuits.
4.3.2
I/O Circuits
HWBB Input Circuit
Use a 0-V common to connect the HWBB function signals. You must connect redundant input
signals.
Pin No.
Signal
Name
Function
1
*
–
–
2
*
–
3
/HWBB1-
Hard Wire Base Block Input 1
For a hard wire base block input. The
base block (motor power turned OFF) is
in effect when the signal is OFF.
4
/HWBB1+
5
/HWBB2-
Hard Wire Base Block Input 2
6
/HWBB2+
7
EDM1-
External Device Monitor Output
Turns ON when the /HWBB1 and the
/HWBB2 signals are input and the SER-
VOPACK enters a base block state.
8
EDM1+
For HWBB function signal connections, the input signal is the 0-V common and the output signal
is a source output. This is opposite to other signals described in this manual. To avoid confusion,
the ON and OFF status of signals for the HWBB function are defined as follows:
ON: The state in which the relay contacts are closed or the transistor is ON and current flows
into the signal line.
OFF: The state in which the relay contacts are open or the transistor is OFF and no current
flows into the signal line.
Input Signal Connection Example
Important
24-V power
s
upply
S
witch
Fu
s
e
/HWBB1+
4
3
/HWBB1-
/HWBB2+
/HWBB2-
4.7 k
Ω
CN8
4.7 k
Ω
S
ERVOPACK
6
5
4.7 k
Ω
4.7 k
Ω
0 V
U
s
e a
s
witch that ha
s
low-current contact
s
.
