Rice Lake MSI-9750A CellScale RF Portable Indicator - Manual (Page 49)

MSI CellScale ® System • 9750A User Guide Page 49
MEASUREMENT SYSTEMS INTERNATIONAL
Firmware Version 5-XX for 2450 Modems
SECTION 8 – SET POINTS
INTRODUCTION
The CellScale system provides extensive Set Point capabilities. Up to 32 Set Points are available. The CellScale
performs the A/D conversions and does limit checking for all the Set Points. The 9750A receives Set Point infor-
mation from the CellScale and responds as programmed.
All 32 Set Points are setup from either the CellScale Terminal Interface, from a 3750CS, or from the 9750A. All
Set Point value parameters are stored in the CellScale and are independent of any other device, including the
9750A. When a Set Point is tripped (true condition) and when it resets, the CellScale transmits to all connected
9750’s a message signifying which Set Point tripped and/or reset. The 9750A can display messages for both
tripped and reset conditions.
The 9750A Meter can fi ll a variety of applications in control, batching, safety and informational warnings. Set
points can be used to trigger RS-232 data transmissions (see “COMM PORTS”). All 32 Set Points can put an
independent message on the display for both tripped and reset conditions.
Unique to 9750A Parameters
The 9750A can respond to the Set Point transmission in several ways:
1) Audible Alarm – 4 unique tones available for both set and reset conditions.
2) Display a message on the alphanumeric display in 3 font sizes. Using the large font size, the whole display
provides a set point indication. The medium font size takes over the bottom two lines with up to 16 characters.
The small font size takes over the bottom line with up to 20 characters.
3) Send a message out the RS-232 port of the 9750A. This message can include weight parameters, time, date,
and any random text the user requires (using MSI @ codes).
These actions are independent of what the CellScale does, and are independent of other 9750’s or 3750CS’s that
might be on the Network. These Set Point actions are stored only in the 9750A and must be programmed inde-
pendently in all 9750’s used in the system.
Parameters stored in the CellScale
All parameters related to the Set Point values are stored only in the CellScale, programmed by a 3750CS or a
9750A via RF, or by the Teminal Interface program directly into the CellScale. These parameters include the
following:
1) One or two threshold values (Value 1 and Value 2).
2) An “Operator” for each value (Oper 1 and Oper 2) which specifi es whether the Set Point is Less Than, Greater
Than, etc..
3) An Operator Relationship (Op Relat) which specifi es an “AND” or “OR” relationship between Value 1 and
Value 2.
4) A “Trigger Type” for each value (Trigtyp1 and Trigtyp2) which specifi es if the Set Point responds to Gross
weight, Net weight, Total weight, or number of samples in the total (nSamples). “nSamples” can also be
thought of as a box counter or load counter.
5) Preact, Postact, and Deadzone – These parameters modify the value of the Set Point for process control
applications. The effect of these value modifi ers is detailed below.
6) Input Source – This parameter relates the Set Point to a position in the Channel List. This allows any Set
Point to be assigned to any input channel or Math channel in the Cell Scale.
The Channel list must be configured in the CellScale. It cannot be programmed from the 9750A.
7) Output Destination – The output destination list is also confi gured in the CellScale and is used to direct Set
Point outputs at the CellScale end. See the CellScale manual for further information on this parameter.
The Output Destination list must be configured in the CellScale. It cannot be programmed from the 9750A.
8) Latching – Any Set Point can be confi gured to Latch on when tripped so even when the set point is no longer
true the output remains on.
9) Delay – Any Set Point can be delayed by up to 10 seconds (10000 ms). Often used to prevent spurious Set
Point outputs.
10) On/Off – Any Set Point can be turned on or off independently from the rest without losing any programmed
parameters.
11) All Set Points On/Off – Used to disable the operation of all 32 Set Points.