723PLUS Digital Speed Control Accessories), DSLC inputs may be sent via Modbus to the 723PLUS and then to the DSLC control through the LON.
Modbus
Address Description–Function
0:0051 DSLC COMMAND USE REMOTE REFERENCE–Set to TRUE to force the DSLC control to use the forced Remote Reference Analog Write 4:0021 Register. Set to FALSE to use the DSLC Hardware Remote Reference. 0:0052 DSLC COMMAND USE PROCESS SIGNAL–Set to TRUE to force the
DSLC control to use the forced Process Signal Analog Write 4:0022 Register. Set to FALSE to use the DSLC Hardware Process Signal.
0:0053 DSLC COMMAND CIRCUIT BKR AUX INPUT–Set to activate the DSLC CB Aux input. This input will not be active unless CFIG DSLC - USE CB AUX is TRUE.
0:0054 DSLC COMMAND USE NETWORK DISCRETE IN–Set to TRUE to force the DSLC control to use the Boolean Write Discrete In signals below. Set the value to FALSE to use the DSLC Hardware DI Signals.
0:0055 DSLC COMMAND CHECK INPUT–Set to activate the DSLC Check input. This input will not be active unless USE NETWORK DISCRETE IN above is TRUE.
0:0056 DSLC COMMAND PERMISSIVE INPUT–Set to activate the DSLC Perm input. This input will not be active unless USE NETWORK DISCRETE IN above is TRUE.
0:0057 DSLC COMMAND RUN INPUT–Set to activate the DSLC Run input. This input will not be active unless USE NETWORK DISCRETE IN above is TRUE.
0:0058 DSLC COMMAND RAISE VOLTAGE INPUT–Set to activate the DSLC Voltage Raise CB Aux input. This input will not be active unless USE NETWORK DISCRETE IN above is TRUE.
0:0059 DSLC COMMAND LOWER VOLTAGE INPUT–Set to activate the DSLC Voltage Lower CB Aux input. This input will not be active unless USE NETWORK DISCRETE IN above is TRUE.
0:0060 DSLC COMMAND BASELOAD INPUT–Set to activate the DSLC Baseload input. This input will not be active unless USE NETWORK DISCRETE IN above is TRUE.
0:0061 DSLC COMMAND LOAD INPUT–Set to activate the DSLC Load/Unload input. This input will not be active unless USE NETWORK DISCRETE IN above is TRUE.
0:0062 DSLC COMMAND PAUSE INPUT–Set to activate the DSLC Ramp Pause input. This input will not be active unless USE NETWORK DISCRETE IN above is TRUE.
0:0063 DSLC COMMAND RAISE LOAD INPUT–Set to activate the DSLC Load Raise input. This input will not be active unless USE NETWORK DISCRETE IN above is TRUE.
0:0064 DSLC COMMAND LOWER LOAD INPUT–Set to activate the DSLC Load Lower input. This input will not be active unless USE NETWORK DISCRETE
Closing the Rated contact ramps the speed set point from idle to rated, if the start reference is removed.
Closing either the Raise or Lower contacts while ramping from idle to rated results in immediate cancellation of the idle to rated ramp. After acceleration to rated speed is completed, the raise and lower commands increase and decrease engine speed based on the raise and lower rate settings. The raise and lower commands will not increase the speed reference above the raise limit or below the lower limit.
If remote operation is selected after the engine reaches rated speed, the control will ramp speed to the reference value set by the Remote Reference milliamp input or the Modbus AW value, as configured, at the raise or lower rate settings. The Remote Reference operates from 4 to 20 mA (1 to 5 Vdc). The rpm values of the 4 mA and 20 mA remote reference set points must be set between the raise and lower limit settings. The 4 mA Remote Reference set point may be set to a lower or higher speed than the 20 mA set point, providing for either direct or reverse-acting remote speed setting.
If the Remote Reference input or the Modbus AW value is present and selected when the Idle/Rated contact is closed or during the idle to rated ramp, the speed reference will ramp to the rpm value set by the Remote Reference milliamp input or the Modbus AW value at the raise or lower rate settings. This may not be the desired mode of operation, so be sure to understand the implications of
operating the control in this manner.
Below 2 mA (0.5 Vdc) or above 21 mA (5.25 Vdc), the Remote Reference input is considered failed or out of range. Between 4 and 20 mA (1 and 5 Vdc), the control determines the required speed reference based on a straight line
between the 4 mA and 20 mA Remote Reference set points (see Figure 6-5). If a difference is detected between the present speed reference and the remote reference rpm value, the present speed reference is ramped up or down at the raise or lower rate until the present speed reference matches the remote speed reference rpm value. The remote reference will not increase/decrease the speed reference above the raise limit or below the lower limit.
When operating in remote mode, if the remote input goes below 2 mA (0.5 Vdc) or above 21 mA (5.25 Vdc) or a Modbus communication link error occurs, the speed reference remains at the present value if the lock-in-last option is TRUE. Otherwise the reference follows the failed or out-of-range remote input value, or the Modbus default AW value, at the raise or lower rate, until a raise or lower limit is reached.
If the Idle/Rated contact is changed to idle after operating at rated, the control will immediately ramp engine speed to idle based on the decel time set point.