Fiber-optic cable, Table 12 - optical power budget ranges, Step 4: update redundant chassis firmware – Rockwell Automation 1756-RMxx ControlLogix Enhanced Redundancy System User Manual User Manual
Page 67: Step 4: update redundant

Rockwell Automation Publication 1756-UM535D-EN-P - November 2012
67
Install the Enhanced Redundancy System
Chapter 3
Fiber-optic Cable
If you choose to make your own fiber-optic cables, consider the following:
• Fiber-optic Communication Cable Specifications
• Determine Optical Power Budget
You can determine the maximum optical-power budget in decibels (dB)
for a fiber-optic link by computing the difference between the minimum
transmitter-output optical power (dBm avg) and the lowest receiver
sensitivity (dBm avg).
The optical-power budget provides the necessary optical-signal range to
establish a working fiber-optic link. You must account for the cable lengths
and the corresponding link penalties. All penalties that affect the link
performance must be accounted for within the link optical power budget.
Step 4: Update Redundant
Chassis Firmware
Use ControlFLASH software to upgrade the firmware of each module in
each chassis.
Attribute
1756-RM2/A
1756-RM2XT
1756-RM/A or 1756-RM/B
1756-RMXT
Temperature,
operating
0…60 °C (32…140 °F)
-25…70 °C (-13…158 °F)
0…60 °C (32…140 °F)
-25…70 °C (-13…158 °F)
Connector type
LC-type (fiber-optic)
Cable type
8.5/125 micron single-mode fiber-optic cable
Channels
1 (transmit and receive fiber)
Length, max
10 km (10,000 m, 10936.13 yd
4 km (4000 m, 4,374.45 yd)
(1)
Transmission
1000 Mbps
Less than or equal to 100 Mbps
Wavelength
1310 nm
1300 nm
SFP transceiver
Transceiver Rockwell PN-91972
Connector/cable: LC duplex connector, 1000BASE-LX-compliant
—
—
(1) Longer distances are supported based on the systems’ optical power budget. See the
Optical Power Budget Ranges on page 67
Table 12 - Optical Power Budget Ranges
Transmitter
Min
Typical
Max
Unit
Output optical power
-15
—
-8
dBm
Wavelength
1261
—
1360
nm
Receiver
Min
Typical
Max
Unit
Receiver sensitivity
—
-38
-3
dBm avg
Receiver overload
-8
—
—
dbm avg
Input operating wavelength
1261
—
1580
nm
IMPORTANT
Apply power ONLY to the chassis containing modules on which you are
upgrading firmware.
Upgrade firmware on only one module at a time.