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4.5 I/O Signal Connections
4.5.4 I/O Circuits
4-39
4
W
iring and Connecting
S
ER
VOP
ACK
s
Sequence Output Circuits
Open-Collector Output Circuits
This section describes CN1 connector terminals 37 to 39 (Alarm Code Output).
The Alarm Code (ALO1, ALO2, and ALO3) signals are output from open-collector transistor
output circuits. Connect an open-collector output circuit to a photocoupler, relay, or line-
receiver circuit.
Note: The maximum allowable voltage and maximum allowable current for open-collector output circuits are as fol-
lows:
•
Maximum allowable voltage: 30 VDC
•
Maximum allowable current: 20 mA DC
Sink Circuits
Source Circuits
Input Signal Polarity
Input Signal Polarity
Photocoupler
Internal Signal Level
Photocoupler
Internal Signal Level
ON
Low level
ON
Low level
OFF High
level OFF High
level
Incorrect wiring or incorrect voltage application to the output circuits may cause short-circuit fail-
ures.
If a short-circuit failure occurs as a result of any of these causes, the holding brake will not work.
This could damage the machine or cause an accident that may result in death or injury.
Example for Photocoupler Circuit
Example for Relay Circuit
Example for Line Receiver Circuit
S
ERVOPACK input
s
ide
S
witch
Photocoupler
Internal
s
ignal
level
Internal
s
ignal
level
Photocoupler
S
witch
24 V
+
−
S
ERVOPACK input
s
ide
24 V
+
−
S
witch
Photocoupler
Internal
s
ignal
level
Internal
s
ignal
level
Photocoupler
S
witch
Important
5 VDC to
3
0 VDC
Photocoupler
0 V
0 V
S
ERVOPACK
0 V
Relay
5 VDC to
3
0 VDC
S
ERVOPACK
5 VDC to
3
0 VDC
0 V
S
ERVOPACK