Siemens SIMATIC 505 - Operator Interface; Module Operation; Status Feedback; Module Functions

Software Interface
2-2
2.1 Module Functions
The T urboPlastic module is a table-driven controller that operates on an
algorithm and requires no programming or setup. A choice of algorithms is
provided, and many flexibilities are available in addition to the actual
profile capability . These flexibilities can be accessed by storing appropriate
values in a table. The module uses eight normal I/O words for handshaking,
start-stop instructions, and status feedback. One of these words tells the
module where in V -memory to look for its parameter table, and another tells
it where in V-memory to place any results. Since the T urboPlastic module
relies on the PLC for non-volatile storage of parametric data, a battery is
not needed.
2.1.1
An operator interface can be used to enter the various parameters into
V-memory . If the process never changes, then these entries can be made
with a programming package like SoftShop t or TISOFT t ; however , a
third-party terminal allows operator adjustments as required. Data also
may be downloaded from a TIW AY

network or other intelligent module to
the PLC for use by the module.
2.1.2
This module can be instructed to run an entire machine cycle without
intervention from the PLC. The PLC needs only a start command to begin
each new machine cycle. When it is necessary that the PLC perform an
operation among any of the five functions, the module can be directed to run
one or more functions, to notify the PLC of completion to that point, and to
wait for further direction. Although a 10-step profile is provided for each of
the five functions, a zero can be entered in any step to cause that function to
terminate at that step. On power -up, any cycle instructions left over from a
previous run are cleared.
When instructed to begin a set of functions, the module reads the data table
and controls on that data until the cycle is complete. Only the Run/Stop
function is monitored and acted upon by the module while running a cycle.
2.1.3
Status feedback is constantly provided to the PLC by the module in the form
of cycle status, indicating exactly which cycle and step is being performed.
• Actual input and output control values
• An indication whether or not the module is able to control within
specified deviation limits
• Current deviation levels
Operator Inter face
Module Operation
Status Feedback