11.2 Hard Wire Base Block (HWBB)
11-3
11
S
afety Function
s
11.2
Hard Wire Base Block (HWBB)
A hard wire base block (abbreviated as HWBB) is a safety function that is designed to shut OFF
the current to the Servomotor with a hardwired circuit.
The drive signals to the Power Module that controls the motor current are controlled by the cir-
cuits that are independently connected to the two input signal channels to turn OFF the Power
Module and shut OFF the motor current.
The input signal uses the 0-V common. The following figure shows a connection example.
For safety 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 safety function are defined as fol-
lows:
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.
Important
CN8
/HWBB1+ 4
3
6
5
/HWBB1-
/HWBB2+
/HWBB2-
0 V
Power
s
upply
Control circuit
S
topped.
S
topped.
Power Module
S
ervomotor
Drive
s
ignal
S
ERVOPACK
24-V power
s
upply
Fu
s
e
S
witch
