6. CONNECTION OF I/O UNITS TO
MACHINE INTERFACE
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1) DC input signal A
DC input signal A is a category of signals sent from machine
components (such as pushbutton, limit switch, relay contact) to the
Power Mate.
2) DC input signal B
DC input signal B is a category of signals sent from the machine to the
Power Mate for high–speed operation.
This category uses a noninsulated interface in which the signals can
be switched between a sink type (24 V common) and a source type (0
V common). However, the emergency stop input must be fixed to a
sink type (24 V common). In addition, safety standards require the
sink type be used.
Both DC input signals A and B should satisfy the following conditions
for contacts on the machine side
Contact capacity:
30 VDC, 16 mA or greater
Open–circuit contact–to–contact leakage:
1 mA or less (for 26.4 V)
Closed–circuit contact–to–contact voltage drop:
2 V or less (for 8.5 mA, including a voltage drop across the
cable)
DC input signal width and delay
Up to 2 ms
5 to 22 ms 5 to 22 ms
Up to 2 ms
ON
OFF
DC input
signal
Logical 1
(contact closed)
Logical 0
(contact opened)
Receiver
output signal
DC input signal A
DC input signal B
6.3
INPUT/OUTPUT
SIGNAL
SPECIFICATIONS
6.3.1
Input Signal
Specifications