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ADVANCED MICRO SYSTEMS, INC. HARDWARE
9
Typical User Input Circuit
(Step, Direction, Ports 1, 2, 3, 4 (used as an input), Jog (3), Limits, Home, Go and Soft Stop)
Output Ports
Two user output ports are provided on the DCB-274 with a power FET output circuit capable of sinking up
to 2 amps DC. They cannot be converted to a sourcing mode. If a source signal is necessary, a relay should
be installed.
The outputs DO NOT include clamping diodes attached to VIO. There is provision for diodes (D1, D2) on
the board .If these diodes are installed; VIO MUST BE EQUAL TO OR HIGHER THAN THE DEVICE
POWER SOURCE VOLTAGE. If a 24-volt solenoid valve is to be driven, the VIO input must be at 24 volts.
Because VIO also defines the logic input levels, this can be a problem. If your design is to drive inductive
loads such as relay or motor coils, you must implement external clamp diodes as required. R3 and R4 should
also be removed.
ANY OF THESE MODIFICATIONS MUST BE PERFORMED BY TECHNICALLY QUALIFIED PERSONNEL.
Port 4 (Configurable user port with JP1 and JP2)
This port can be configured as either an input port (as described above) or an output port.
Port 4 defined as: JP1 JP2 Comment
Input 2-3 Yes Reference “l 16” (lower case L)
command in the software section.
Output 1-2 None
Port 4 Input / Output Circuit
PIN 1
Comparator
10k10k
VIO
Pin
Input
Pin
CPU
GND
Pin
+5 Internal Power Supply
10k
VIO/2
To other comparators
5 V
Pin
Connector
VIO
4.6 - 30 Vdc
+
PLC
STD
1
2
3
PLC
Signal
STD
Signal
Mosfet
Load
+
-
Optional Clamp
VIO
Comparator
SMC-26
Microprocessor
VIO/2
JP-2
JP-1
I/O Connect
1
3