I
NSTALLING
THE
SMD34K
SMD34K User Manual
ADVANCED MICRO CONTROLS INC.
88
1.8 Digital Input Wiring
1.8.1 Cable Shields
Because they are low power signals, cabling from the sensor to the SMD34K should be done using a twisted
pair cable with an overall shield. The shield should be grounded at the end when the signal is generated,
which is the sensor end. If this is not practical, the shield should be grounded to the same ground bus as the
SMD34K.
1.8.2 Inputs 1 and 2
Inputs 1 and 2 are single ended inputs that share the DC Common return
pin. They accept 3.5 to 27 Vdc without the need for an external current lim-
iting resistor. If using 48 Vdc sensors, a 5 kilohm resistor that is wired in
series with the input pin is required. Figure T1.8 below shows how to wire
discrete DC sourcing and sinking sensors to inputs 1 and 2 of the
SMD34K. Colors in parentheses are the appropriate wire color for the
CNPL-2M and CNPL-5M cables.
Figure T1.8 Wiring - Inputs 1 & 2
1.8.2.1 Sinking Sensors Require a Pull Up Resistor
Sinking output sensors require an external pull up resistor because inputs 1 and 2 of the SMD34K units also
sink current. Table T1.1 below shows the values of pull up resistors that will allow the unit’s input to activate
along with the current that the sensor must be able to sink when it is active.
Table T1.3 Pull Up Resistor Values for DC Inputs
The logical states of the sensor and SMD34K input will be reversed. The SMD34K input is off when the sen-
sor is active. You can set the logic state of the input when you configure the unit.
Input
Voltage
Pull Up
Resistor
Sensor Current
When Active
5 Vdc
300 ohm
16.7 mA
12 Vdc
1.4 kilohm
8.6 mA
24 Vdc
3.8 kilohm
6.3 mA
Input
Optocoupler
Input
Optocoupler
Input 1
Input 2
DC Common
Figure T1.7 Schematic - Inputs 1 & 2
Input1 or Input2
Input1 or Input2
DC Common
DC Common
+
+
+
+
–
(WHT or BLK)
(WHT or BLK)
–
5 to
24 Vdc
5 to
24 Vdc
PNP
Sourcing
Sensor
NPN
Sinking
Sensor
Out
Out
R
PULLUP
1.9.1
1.9.1
1.8.2.1
(BLU)
(BLU)
Summary of Contents for SMD34K
Page 1: ...MICRO CONTROLS INC ADVANCED U s e r M anual Manual 940 0S280 ...
Page 6: ...TABLE OF CONTENTS SMD34K User Manual ADVANCED MICRO CONTROLS INC 6 Notes ...
Page 50: ...CALCULATING MOVE PROFILES SMD34K User Manual ADVANCED MICRO CONTROLS INC 50 Notes ...
Page 62: ...CONFIGURATION DATA FORMAT SMD34K User Manual ADVANCED MICRO CONTROLS INC 62 Notes ...
Page 80: ...COMMAND DATA FORMAT SMD34K User Manual ADVANCED MICRO CONTROLS INC 80 Notes ...
Page 100: ...LEADERS IN ADVANCED CONTROL PRODUCTS ADVANCED MICRO CONTROLS INC ...