Modbus Applications; Remote Control; Remote Start/Stop And Acknowledgement - Woodward easYgen-2000 Series User Manual

6.6

Modbus Applications

6.6.1

Remote Control

6.6.1.1

Remote Start/Stop And Acknowledgement

37535B
Modbus Applications > Remote Control > Remote Start/Stop And Ackn...
The Woodward controller may be configured to perform start/stop/
acknowledgement functions remotely through the Modbus protocol.
The required procedure is detailed in the following steps.
The following descriptions refer to the remote control
parameter 503 as described in Ä Chapter 9.2.3 "Addi‐
tional Data Identifier" on page 527.
It may be necessary to shift the address by 1
depending on the used PC software. In this case, the
address would be 504 for example.
Be sure to check both possibilities in case of remote
control problems.
ID Parameter
503 Remote control word 1
Modbus address = 40000 + (Par. ID +1) = 40504
n
Modbus length = 1 (UNSIGNED 16)
n
In order to issue a command, the respective bit of object 21F7
(hex), i.e. parameter 503, must be enabled. The following bits are
used for this:
Bit 0 Start bit:
n
This bit activates the LogicsManager command variable 04.13
"Remote request" and enables a remote request command.
Bit 1 Stop bit:
n
This bit deactivates the LogicsManager command variable
04.13 "Remote request" and disables a remote request com‐
mand.
Bit 4 Acknowledgement bit:
n
This bit activates the LogicsManager command variable 04.14
"Remote acknowledge". This bit must be set and reset twice to
acknowledge an alarm completely. The first rising edge disa‐
bles the horn and the second rising edge resets the alarm.
The following Modscan32 screenshot (Fig. 200) shows the configu‐
rations made to remote control parameter 503. It is possible to set
the format to binary to view single bits using the "display options".
Fig. 200: Modbus - remote control parameter 503
easYgen-2200/2500 | Genset Control
Application
Setting range Data type
0 to 65535 UNSIGNED 16
427