Inputs/outputs modules: MPNE
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ME7087_13 04/21
4.2.3 Terminating resistence
The two-position dip switch on the top of the unit inserts a 120 Ohm resistor on the
RS485 line. Put both mini-dips to ON. Enter termination resistance only to the last
device in the Modbus chain.
Fig.: Terminating resistence
4.3 Watchdog
MPNE1001 implements a watchdog function that resets the connected digital outputs
if no query is received within the time set in the variable MPNE_Watchdog
(expressed in seconds). To disable the watchdog function (default), simply set the
variable to zero.
Once the watchdog is triggered on MPNE1001 the digital outputs are reset to zero
and the LED LINK on the base is turned on .
5 Memory map ModBus RTU registers
The MPNE1001 is a RTU ModBus bridge. The following table shows the memory
map.
ATTENTION:
within the Crosstable Editor it is possible to import directly the
variables associated to the registers. Press the right button inside the table and select
“
Paste MPNE10 Module
”.
Variable
Type
Decimals Modbus
register
Access
Description
MPNE_FwRev
UINT
0
0
[RO]
Firmware revision
MPNE_ExpID
UINT
0
1
[RO]
Expansions identification
MPNE_ExpType
UINT
0
2
[RO]
Type of connected expansions
Bit 0..3 expansion 1 present
Bit 4..7 type of expansion 1
0 : no expansion
1: digital input expansion
2: digital outputs expansion
5: analog I/O
