Function Blocks - Siemens Moore 353 User Manual

UM353-1

3.0 FUNCTION BLOCKS

This section contains a detailed description of each function block (FB) available for configuration
block description is supplemented by: (1) a drawing of the block showing data inputs and outputs and control lines,
(2) a block parameter table. Most blocks are further described by a block diagram that shows the block's circuitry
in a simplified or equivalent circuit form.
This User's Manual includes the additional functionality provided by MPU Controller
Board firmware Versions 1.3, and 2.0 through 3.0. These enhancements appear mainly in
Sections 2 and 3. They are identified by the phrase "in firmware 1.3 and higher" or the
two-digit firmware version (e.g. "V1.3" or "V2.4") in text.
Keep your controller firmware current by subscribing to updates. The latest firmware
version often provides performance options (e.g. additional function blocks, parameter
selections) not available in an earlier version.
Function blocks have three types of inputs/outputs: digital, analog, and special data structure.
1. Arrows with dark shading and white letters are digital (outputs are displayed as 0 and 1 in the VIEW mode
when using the local faceplate). Digital outputs are typically used to designate function block status, logical
outputs, and on/off function block outputs. Some examples are:
•
Function block status: E/I status (IS, ES, SI), A/M status (AS, NA, MS, ES, SS), and Quality Status (QS)
•
Logical Outputs: AND (01), OR (01), NOR (01), or NOT (01)
•
On/Off function blocks: One Shot Timer (01), Retentive On Timer (01), Rising Edge Trigger (01), Alarms
(A1, A2, A3, and A4), and Comparator (01)
2. Arrows with medium shading and black letters are analog. Internally they are REAL floating point numbers
and outputs of these types will be displayed in the VIEW mode when using the local faceplate with the decimal
point located to allow greatest resolution between 0.00000 and 999999 or -0.0000 and -99999. Numbers
outside this resolution will blink.
Analog outputs are typically output (01) for analog I/O blocks and math functions. Analog outputs may also be
specific to a particular function block such as the Analog Output (AO), Step Number (SN), Step Time (ST),
Remaining Time (RT), and Current Recipe (CR) outputs of the Program Sequencer.
3. Arrows with medium shading and black letters but with a white tip are special data structures for range scaling
information and will not be displayed in the VIEW mode). Range scaling information is used when there is a
conversion of units within a function block, for example, the Alarm block scales the alarm limits into process
engineering units when the range pointer is configured to the process analog input block. If unconfigured the
units default to 0-100%. The output range (OR), typically used on analog output function blocks, includes
MIN and MAX SCALE, the DPP (Decimal Point Position), and the ENGUNITS (Engineering Units). The
analog output block is typically used for a 0-100% output to a valve where a minscale of 0 = 4 mA output and a
max scale of 100 = 20 mA output.
The output range is connected to the Range Pointer (input R) of functions blocks requiring scaling other than
the default 0-100. For example, an Analog input block could be scaled 0-5000 psig with output (01) connected
to the AOUT input (S) and the AIN (OR) connected to the AOUT input (R). The Analog output would then
output 4 mA at a minscale of 0 psig and 20 mA at a maxscale of 5000 psig. In contrast, if AOUT input (R)
were left unconfigured the output would equal 4 mA at a minscale of 0 psig, 20 mA at a maxscale of 100 psig
and over ranged for any input over 100 psig.
4
The LonWorks function blocks used in Models 352P, 353, and 354/354N are described in this manual. The Ubus function blocks used in
TM
Procidia (UAH, UAI, UAO, UDI, UDO, UEI, UER, UET, URI, USD, and UTI) are included in the firmware but are not described here since
they will not operate in Models 352P, 353, and 354/354N.
March 2003
NOTES
Function Blocks
4
. Each function
3-1