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Chapter 6: Configuring System
Parameters Table (A197_SYS)
The A197_SYS table allows the user to configure System Parameters to be sent to the SRU at
startup for its configuration. This table contains one record for each system parameter the user
wishes to send to the SRU at system startup or when communication is re-established with the
SRU after being off-line.
Name Range Description
Address 0 .. 65535 This parameter specifies the word address of the System Parameter to be sent to the
SRU.
Value 0 .. 65535 This parameter specifies value of the System Parameter to be sent to the SRU.
Table 9 System Parameters Table Parameters
Table 10 shows the configurable System Parameters that are specific for the Coupler for Allen-
Bradley Data Highway. The System Parameters Table (A197_SYS) can be used to direct the
ANSI X3.28 DCA to send any of these parameters to the SRU at system startup and every time
communication is re-initiated after being offline. To instruct the coupler to store the parameters
to EEPROM, the last parameter in the selected range should have an Address of 3002 and a
Value of 1. This will force the DCA to send a "Store to EEPROM command" after all the
parameters have been sent.
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☞NOTE: The Duplex-Mode configured in the Communication Port Table
(A197_COM) and the AI with time parameter in the SRU Table
(A197_SRU) must match the configuration of the SRU. You can use this
table to configure the ANSI X3.28 DCA to send the correct parameters to
the SRU at startup. Also, ensure that the DI Event parameter is disabled in
the coupler since the ANSI X3.28 DCA does not support DI events, it only
supports DI Change.