Data Mapping UM353-1B
April 2012
6-2
6.2 STATION DATA
A station contains some data that pertains to the entire station and some to individual loops. Station data, available
over the network, is part of the station function block (STATN) configuration and is mapped to fixed locations in
Modbus registers or coils. Loop data (detailed in the next section) can be associated with an ODC “Controller,” an
ODS “Sequencer,” an ODA “Analog Indication”, an ODD “Discrete Indication”, or an ODP “Pushbutton
Operation” operator display.
Much of the analog data is available is two formats. The first is 16-bit values, scaled consistent with previous
legacy controller products, enabling integration into existing legacy systems. This data type also provides Modbus
masters, unable to handle 32-bit floating point, a method for obtaining data from the station.
The second is the standard 32-bit IEEE floating point format consistent with the actual data in the station. This data
type is contained in two consecutive registers or parameters.
• The LSW is first and the MSW second.
• Boolean values are available in coils.
• String data, formatted as 2 ASCII characters per word with the left-most character in the most significant byte,
containing tag, units, and message information.
Most Station data is ‘Read Only’ except as noted in Section 6.2.1 Integer Data.
6.2.1 Integer Data (16-bit Integer)
Code
R/W Description Range Register (MB)
GDS R Global Data Size (LIL)* 7-256 ($0007-$0100) n/a
ST R Station Type 6 ($0006) 40001
SSW R/W Station Status Word (see Station Status Word) (see coils)
SE R/W Station Error 0-32767($00000-$7FFF) 40002
NCL R No. of Control Loops (# of ODC) 0-255($0000-$00FF) 40003
NSL R No. of Seq. Loops (# of ODS) 0-255($0000-$00FF) 40004
RAM R RAM Size (size in K bytes) 0-65535($0000-$FFFF) 40005
CBT R Controller Board Type (see below) 40006
CBSR R Controller Board Software Rev. # (see below) 40007
EBT R Expander I/O Board Type (see below) 40008
EBSR R Exp. I/O Board Software Rev. # (see below) 40009
RBT R Remote I/O Board Type (A-1)* (see below) 40010
RBSR R Remote I/O (A-1) Software Rev. #* (see below) 40011
NBT R Network Board Type (B-1)* (see below) 40012
NBSR R Network (B-1) Software Rev. #* (see below) 40013
OAT R Option Board A Type (A-2)* (see below) 40014
OASR R Option A (A-2) Software Rev. #* (see below) 40015
OBT R Option Board B Type (B-2)* (see below) 40016
OBSR R Option B (B-2) Rev #* (see below) 40017
OFT R Operator Faceplate Type (see below) 40018
DRN R Model 353 Database Rev. No. 0-32767($0000-$7FFF) 40019
CWT R Computer Watchdog Timer (sec) 0-1000 ($0000-$03F8) 40020
KSR R Kernel Software Rev. # (see below) 40021
CT R Cycle Time (msec) 0-32767($00000-$7FFF) 40022
Lx
T R Loop - Type (0-5) 40023-40047
(0-none, 1-controller, 2-sequencer, 3-analog ind., 4-discrete ind., 5-pushbuttons)
MSLCP R/W Modbus Seq. Loop Config. Pt 0-25 ($0000-$0019) 40048
SA R/W Station Address 0-250 ($0000-$00FA) 40049
*
Station Data that applies to other 353 controllers and does not apply the 353 “Design Level B.”
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