Allen-Bradley ProcessLogix 1756-IA16, Reference Manual, Page: 103 / 120

Publication 1757-RM810A-EN-P - May 2002
Functional Blocks 3-63
MESSAGE
NUMERIC
Description Provides up to 16 user configurable messages (MESSAGE [n]) that can be triggered by a client of the block. Where “n”
is the number of the message. A client can be the output from a Step block in a Sequential Control Module (SCM).
Function
•
Each message type can be configured (MSGTYPE [0..15]) to be either information only or for confirmation.
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When a client triggers a given send flag (SENDFLAG [n]) input, the corresponding message (MESSAGE [n]) is sent
to the Message and the Event Summary displays in the Station application.
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For information only type messages, the client trigger sets the corresponding SENDFLAG [n] to True. Since the
SENDFLAG [n] is a pulse trigger, it is automatically set to False during the next execution cycle. This means the
MESSAGE block is ready to send the same message again in the next cycle.
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For confirmation type messages, the client trigger pulses the corresponding SENDFLAG [n] to send the MESSAGE
[n] to the ProcessLogix Server. The client of the MESSAGE block checks for the confirmed parameter (CONFIRMED
[n]) to be set to True. The CONFIRMED [n] parameter indicates whether the MESSAGE block has received a
confirmation.
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If the Message block is connected to a block whose output is a Boolean and the Boolean becomes True, the
Message block will generate the message every time the Message block executes until the Boolean output turns
False. If the desired behavior is to generate a one time message, then the message block should be driven by a
Pulse Output.
Inputs/Outputs Up to 16 inputs (SENDFLAG [0..15]) and 16 outputs (CONFIRMED [0..15]), depending on the message types configured.
Parameters CONFIRM [0..15]
CONFIRMED [0..15]
DESC
EUDESC MESSAGE [0..15]
MSGTYPE [0..15]
ORDERINCM
SENDFL [0..15]
Description Provides storage for a floating point value that is accessible via the PV configuration parameter.
Function
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Used to store up to 8 bytes of a floating point value within defined upper and lower limits for use in a control
strategy.
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Configurable high and low limits are also provided.
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Also supports a configurable access lock which determines who can write a value to the block (such as operator,
engineer, or another function block.).
Inputs/Outputs PV is only exposed block connection, but you can expose other block parameters through the Configure Block form in
Control Builder.
Parameters ACCLOCK
ORDERINCM
PV PVFORMAT
PVHILM
PVLOLM
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