Definition Of Fiber Optic Diagnostics; Port Assignment For Point-To-Point Connections; Port Assignment For Star Structures - Phoenix Contact PSI-MOS-RS232/FO 850 E Datasheet

8

Definition of fiber optic diagnostics

The quality of the path is determined using the incoming op-
tical power P and displayed using the LED bar graph.
opt
You use DIP 2 to switch idle senders (reset period between
sending data) to continuous illumination (INVERS). This al-
lows for continuous fiber optic diagnostics.
If you switch DIP 2 to "ON" (NORM), the diagnostics are not
available via the LED bar graph.
LED bar Receive
graph status
Green
Green Very good
Yellow
Green
Good
Yellow
Yellow Critical
Red Error
As soon as the system reserve is reached, only the yellow
LED remains lit. At the same time, the signaling relay drops
and the switch contact opens. Data communication is still
possible.
If you switch DIP 2 to "ON", the FO diagnostics
are not available via the LED bar graph.
The LED bar graph can light up at high transmis-
sion speeds or flash at low transmission speeds.
This display does not correspond to continuous
evaluation of the optical power.
Basic method of operation
The device has three interfaces for the RS-232 signal:
– Electrical interface (D-SUB)
– Fiber optic port
– DIN rail connector
You can change communication between the ports via
DIP 1. This allows you to implement point-to-point or star
structures.
8.1

Port assignment for point-to-point connections

The electrical interface communicates with the fiber optic
port by means of full duplex mode. Internal data communi-
cation is disabled via the DIN rail connector.
103266_en_02
Optical power P
opt
P is significantly greater
opt
than the system reserve
P is still greater than the
opt
system reserve
P has reached the system
opt
reserve
P has sapped the system
opt
reserve/broken fiber
Terms
– DIP 1 = "OFF" (LINE)
– One RS-232 device at each fiber optic coupler
– The RS-232 devices can be addressed via communica-
tion software.
– Up to 6 fiber optic converters in a linear structure
Master
D-SUB
FO port A
Slave
Figure 4 Port assignment for point-to-point connections
8.2

Port assignment for star structures

By means of full duplex mode, the electrical interface com-
municates with all connected fiber optic ports of the star
coupler via the DIN rail connector. Therefore internal data
communication is in the direction of the master (electrical in-
terface). Telegrams from the master are output to the fiber
optic ports of all connected devices via the DIN rail connec-
tor.
The telegrams received at the fiber optic ports of the slaves
are forwarded to the master exclusively via the DIN rail con-
nector. No telegrams are exchanged between the slaves.
Terms
– DIP 1 = "ON" (STAR)
– One RS-232 device at each fiber optic port
– Only connect the master to the star coupler.
– The RS-232 devices can be addressed via communica-
tion software.
Master
D-SUB
T-BUS
FO port A
Slave 1
Figure 5 Star structure port assignment
PSI-MOS-RS232/FO 1300 E
T-BUS
D-SUB
T-BUS
FO port A
Slave 2
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