Figure 1-2. User Interface Terminal
3
Front Panel
The SMC20 front panel provides all the
controller’s connections to the motion
control system. Refer to Figure 1-1 to
locate the connections (viewed from top
to bottom; left column, center column,
right column):
Left Column
D
Power input (120 VAC @ 2A)
D
Isolated DC supply; 24 Volts,
unregulated.
D
Power ‘On’ LED indicators.
D
Fuse.
Center Column
D
Axis 1 (X)
D
“Enable” and “CPU” LED indicators.
D
Common system. (Opto-isolation
power, enable, etc.)
D
Axis 2 (Y)
Right Column
D
Axis 1 (X) position sensor.
D
Axis 2 (Y) position sensor.
D
RS232C communication port.
D
RS422/485 communication port.
Axis 1 (X) and Axis 2 (Y) connections
each include pins for eight inputs and
eight outputs. These inputs/outputs are
digital.
LED indicators immediately adjacent to
Axis 1 and Axis 2 connections show
which pins are active.
Communication Interface
Communication between an operator
and the SMC20 occurs through the
communication interface, a board that
plugs into the controller.
The standard communication interface
provides two serial ports – RS232C and
RS422/485. The RS422/485 port is
dedicated to the operator Hand-Held
Terminal. The RS232C port is used for
a printer.
Hand–Held Terminal
The Hand-Held Terminal, Figure 1-2,
connects to the RS422/485 port. This
menu driven display and keyboard
provides a convenient and simple
method of programming the SMC20.
The terminal is detachable or it can be
secured to the SMC20 unit.
Printer Interface
The RS232C port is configured to be
used with a serial printer. Printer set-up
is described later in this manual. The
controller can list, program and set-up
parameters to the printer.
