Foxboro A431:A593 P0924TR Analog Input Interface Module
The FBM232canaccess up to 64 devices to read or write data. From the Foxboro
DCScontrol station to which the FBM232 is connected, up to 2000 Distributed Control
Interface (DCI) data connections can be made to read or write data. Supported data
types are determined by the particular driver loaded on the FBM232. which converts
the data to the DCI data types listed below:
• Ananaloginput or output value (integer or IEEE single-precision floating point)
• Asingle digital input or output value
• Multiple (packed) digital input or output values (packed in groups of up to 32
digital points per connection).
Control Block Support
The FBM232offers control block support for the following standard Foxboro DCS
Distributed Control Interface (DCI) block types:
BIN
Binary Input
BINR
Binary Input Redundant
BOUT
Binary Output
IIN
Integer Input
IOUT
Integer Output
PAKIN
Packed Input
PAKOUT
Packed Output
PLSOUT
Pulse Output
RIN
Real Input
RINR
Real Input Redundant
ROUT
Real Output
STRIN
String Input
STROUT
String Output
The DCI blocks are configured just like other Foxboro DCS control blocks. The DCI
blocks address and read/write data from/to the addressed field device.
Thus the FBM232 can access up to 2000 analog I/O values, or up to 64000 digital I/O
values, or a combination of digital and analog values up to the maximum capacity a
user allows within the sizing guidelines of the control processor. The frequency of
access to the FBM232 data by a control station can be as fast as 500 ms. The
performance depends on each device type and the layout of data in the device.
The FBM232collects the required data from the devices, performs the necessary
conversions, and then stores the converted data in its database for incorporation into
the Foxboro DCS plant management functions and operator displays. Data may also
be written out to the individual devices from the Foxboro DCS system.
Fieldbus Communications
The Fieldbus Communications Module (FCM100Et or FCM100E) or the Field Control
Processor (FCP270 or FCP280) interface the redundant 2 Mbps module Fieldbus
used by the FBMs. The FBM232 accepts communication from either path of the
redundant 2 Mbps module Fieldbus- should one path fail or be switched at the system
level, the module continues communication over the active path