3.2 I/O Signal Connections
3.2.3 I/O Circuits
3-8
3.2.3
I/O Circuits
Sequence Input Circuits
This section describes CN1 connector terminals 15-14 (Homing Deceleration Switch Input).
The output circuit for the Homing Deceleration Switch signal from the host controller can be
either line-driver output or open-collector output. These are shown below for each type.
The wiring specifications for CN1 connector terminals 15-14 and 40 to 47 are different.
Wire the terminals according to the information described in this section (Sequence Input Cir-
cuits).
The SERVOPACK may fail if the terminals are wired incorrectly.
Line-Driver Output Circuit
Open-Collector Output Circuits
(12-V Power Supply in SERVOPACK)
• Precaution When Host Controller Uses Open-Collector Output with User-Supplied Power Sup-
ply
The SERVOPACK may fail depending on the relationship between the pull-up voltage (Vcc) and
the pull-up resistance (R1). Before you wire the circuits, confirm that the specifications of the
host controller satisfy the values shown in the following table.
150 Ω
4.7 kΩ
Applicable Line Driver:
SN75ALS174 from Texas
Instruments or equivalent
Host controller SERVOPACK
2.8 V ≤ (High level − Low level) ≤ 3.7 V
If the above formula is not satisfied, the inputs to the
SERVOPACK will be unstable, and the Home Deceleration
Switch Input may be identified as ON even though the
switch has not been turned ON.
SERVOPACK
Host controller
PL3 terminal
0 V
+12 V
4.7 kΩ
150 Ω
ON:
1.5 V max.
Approx.
9 mA
Pull-Up Voltage (Vcc) Pull-Up Resistance (R1) Output Current (i)
24 V 1.8 kΩ to 2.7 kΩ
20 mA max.12 V max. 820 Ω to 1.5 kΩ
5 V max. 180 Ω to 470 Ω
Circuit Example for Open-Collector Outputs
SERVOPACK
VF = 1.5 V to 1.8 V
Vcc
Tr 1
V
F
R1
i
Host controller
150 Ω
4.7 kΩ
Pull-up
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