 The MSP family of analog
I/O blocks offers the freedom to use any analog sensor with many
models of PLC. Each MSP block provides a single analog input
(or output) interface between the PLC and the analog world. Communications
between the MSP unit and the PLC is through a patented protocol
that provides truly "open" architecture for analog signals to
be processed digitally.
The MSP is factory pre configured to support
a specific analog input or output signals, depending on the model.
Optionally, the MSP signal range can be reconfigured in the field
using the Windows™ based configuration software model SCC-CC-A1
(sold separately).
Input Analog Signal
The analog input signal is isolated, filtered, amplified, scaled
and/or linearized by the MSP micro-processor and converted
to a 16-bt, binary weighted, digital word which is transmitted
serially (one bit at a time) at 24VDC signal levels to the
PLC’s discrete I/O port. At the PLC, each binary-weighted
bit sent to the discrete input is temporarily stored until
all 16 bits have been received. The digital word is then reassembled
and its value (proportional to the analog signal) is placed
in a working register of choice for decision making by the
PLC program.
Output Analog Signal
The numerical value representing a desired analog output signal
is placed into a PLC working register of choice. This value
is transmitted serially (one bit at a time)at 24VDC signal
levels to the MSP through the PLC ’s discrete I/O port.
The MSP scales, linearized and proportionally converts the
digital signal to the voltage or current output signal. The
signal is then sent to the isolated output channel for use
by a analog actuator connected at the output channel. Dimensional
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