Woodward easYgen-2000 Series User Manual page 381

Special Applications > Performing Remote Start/St... > Remote Start/Stop And Ackn...
System reaction
Fig. 158: Command variable
Bit enabling via Modbus protocol
and RS-485 interface
37535B
Acknowledgement:
The command variable "04.14 Remote acknowledge" reflects
n
the acknowledgement bit (ID 503, bit 4).
An acknowledgement is generally performed twice:
n
– 1st change of the logical output "External acknowledge"
from "0" to "1":
Silence horn
– 2nd change of the logical output "External acknowledge"
from "0" to "1":
Acknowledges all inactive alarms
The easYgen does NOT react on the disabling of the
start bit, but only on the enabling of the stop bit.
This has the advantage that it is not required to main‐
tain the connection established for the whole time in
case of a remote start.
The following figure shows the reaction of the command variable
on the various changes of the bits:
Enabling the bits may be performed with the following methods:
Bit Enabling via Modbus Protocol and RS-485 Interface
n
Bit Enabling via CANopen Protocol and CAN Interface 1
n
The parameter Modbus Slave ID must be configured.
The control bits are sent on address 503 for a start via Modbus:
Bit 0: Start
n
Bit 1: Stop
n
Bit 4: Acknowledgement
n
Bits 2 and 3: must be "0" (for the watchdog).
n
Please refer to Ä Chapter 6.6 "Modbus Applications"
on page 427 for a description of how to enable control
bits via Modbus.
easYgen-2200/2500 | Genset Control
Application
381