PD6830X Explosion-Proof Modbus Scanners
Instruction Manual
24
Slave Mode (
SLAVE
)
In Slave mode, a Modbus master may write up to 16
Modbus PVs to the scanner, which can then display
and process the data in the PV Modbus registers,
such as displaying the data and using them in math
functions.
Programming the scanner for Modbus Slave mode
will include defining the Modbus PV registers that are
enabled, as well as selecting the time between data
writes before an error is assumed. In Slave mode the
scanner accepts floating point data (Byte order: 1234
big endian).
PV Number Configuration (
PV NUM
)
The
PV Number
menu is used to enable and disable
each Modbus PV 1 to 16. PVs that are not enabled
will not appear in other programming menus for
display or inclusion in math channel functions (CV).
PV1 to PV16 are programmed in identical menus.
Enable/Disable PV
(
ENABLE
,
DISABLE
)
Enable or disable the Modbus PV. Disabled PVs will
require no additional configuration. Disabled PVs will
not be accessible in other menus or functions.
The Slave mode accepts floating point data type (Byte
order: 1234 big endian).
Slave Response Timeout (
TIMEOUT
)
If the Modbus data registers for the enabled Modbus
PVs are not updated within a certain period of time,
the scanner can presume that there is an error with
the data, or that it is too out of date to be worth dis-
playing. In this case, the scanner will display this PV
as NONE (
NONE
).
At the
Response Timeout
menu, enter the time limit
for the scanner to continue to display data written to
the Modbus PV register. To disable this feature, and
always display the last data written to the Modbus
register regardless of how long ago the data was
updated, set this value to 0 seconds.
