4.8 Safety Function
4-59
4
Op
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(6) Connection Example and Specifications of Input Signals (HWBB Signals)
The input signals must be redundant. A connection example and specifications of input signals (HWBB sig-
nals) are shown below.
Connection Example
Specifications
The input signals (HWBB signals) have the following electrical characteristics.
• For safety function signal connections, the input signal is the 0 V common and the
output signal is the source output. This is opposite to other signals described in this
manual. To avoid confusion, the ON and OFF status of signals for safety functions are
defined as follows:
ON: The state in which the relay contacts are closed or the transistor is ON and cur-
rent 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.
• When using the HWBB function, always use a 24-VDC power supply for the DC
power.
Type
Signal
Name
Connector
Pin Number
Setting
Meaning
Input
/HWBB1
CN8-4
CN8-3
ON (closed)
Does not use the HWBB function. (normal operation)
OFF (open)
Uses the HWBB function. (motor current shut-off
request)
/HWBB2
CN8-6
CN8-5
ON (closed)
Does not use the HWBB function. (normal operation)
OFF (open)
Uses the HWBB function. (motor current shut-off
request)
CN8
CN8
24-V power supply
Fuse
Switch
/HWBB1+
/HWBB1-
/HWBB2+
/HWBB2-
SERVOPACK 1
4
3
6
5
0 V
/HWBB1+
/HWBB1-
/HWBB2+
/HWBB2-
SERVOPACK 2
4
3
6
5
Use a switch that has
micro-current contacts.
Items
Characteristics
Remarks
Internal Impedance
3.3 k
Ω
−
Operation Movable Volt-
age Range
+11 V to + 25 V
−
Maximum Delay Time
20 ms
Time from the /HWBB1 and /HWBB2 signals are OFF to
the HWBB function operates.
