ProSoft Technology inRAx MVI56-CAS, Руководство пользователя

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MVI56-CAS ♦ ControlLogix Platform Reference
Teledyne CA Slave Module
Page 70 of 86 ProSoft Technology, Inc.
December 26, 2007
5.7 MVI56-CAS Command Control
Command Control data is received from other nodes on the network that can
control the MVI56-CAS module. Specific values are written to regions of this
block to control the module. Currently, the module is programmed to handle the
receipt of the following requests: write configuration to processor, warm boot and
cold boot.
The remote node controls the module by writing one of the following values to
register 6800:
Value Description
9997 Write configuration in database to the processor and warm boot the module.
9998 Warm boot the module.
9999 Cold boot the module.
The control register is cleared (a value of 0) after the operation is executed with
the exception of the 9997 command. If the module fails to successfully transfer
the configuration to the processor, an error code will be returned in the control
register as follows:
Value Description
0 No error, transfer successful
-1 Error transferring general configuration information.
Ladder logic must handle the 9997 command. No ladder logic is required when
using the warm or cold boot commands.
5.8 Protocol Commands
The ProSoft Technology CAS module communication driver supports several
data read and write commands. When configuring an application, it may be
important to understand how the commands function in order to determine how
to structure the application data.
5.8.1 Data Read Functions
As stated in earlier sections, the data sent to the master is taken directly out of
the module's memory at the time a response is sent.
Function Function Name Description
1 Read Status Data The module supports access to a total of up to 250 words of
status data from the ladder processor. In TCAP vernacular,
the "Start Card Address" identifies the starting word, and the
"Number of Cards" identifies the number of words.
2 Read Analog Data The module supports access to a total of up to 250 words of
analog data from the ladder processor. In TCAP vernacular,
the "Start Card No." and the "Start Point No." (upper and lower
four bits respectively) are treated as one byte to develop a
starting word address, while the "Number of Analogs"
determines the number of words to be returned to the master.