Hardware
Hardware Configuration
4 - 22
SKF Multilog O
n-Line System IMx-M
User Manual
Front Panel BNC Buffered Outputs
In addition to the back side buffered outputs, IMx-M offers a feature where a
user can select up to three channels to be directed to BNC connectors for
buffered outputs.
These BNC connectors (2 for analog buffered outputs and 1 for digital buffered
output) are located on the front panel of protection module, as shown in
Protection Module (PRM)Protection Module (PRM).
•
The channel selection can be done using the Local display selection keypad
located on the front panel of each condition monitoring module. Refer to
Condition Monitoring Module (CMM) for the location of the local display
selection keypad.
•
One channel per buffered ou
tput can be selected.
•
First two outputs are for analog signals and the third output is for a digital
signal.
•
The buffered analog signal is divided by 2.
The measuring instrument connected to these buffered outputs must
compensate for this. This can be done by using a sensitivity that is 50% of the
connected sensor. For example, if the sensor is 100 mV/g, then set the
sensitivity on the measuring instrument to 50 mV/g.
•
The buffered analog outputs are maximum ±11 V and cutoff frequency (-3
dB) is at 60 kHz.
•
The buffered digital outputs are 5 V TTL signal.
Protection Part Configuration
RS485 Modbus
Each protection module has 2 separate RS485 Modbus connections L1 and L2 for
redundant operation.
The physical locations of RS485 connection L1 and L2 are found in the back of CMM +
PRM slot as shown in Protection Module (PRM).
The connection diagram is found in
RS485, Relay Outputs, Rack Disarm
Outputs, Rack DisarmRS485, Relay Outputs, Rack Disarm
The RS485 Modbus for protection module shall only be terminated at the end(s) of the
bus. At each protection module, termination of 120
Ω
can be manually activated by DIP
switch as shown in the table below.
Table 4-7: RS484 Modbus termination DIP switch settings for L1, L2.
RS485 Modbus Termination DIP Switch Settings
L1
L2
DIP Switch Setting
OFF
OFF
0000
ON
OFF
1000
OFF
ON
0100
ON
ON
1100