ESP Safety UPES-50D, Operating Manual, Page: 8 / 51

8
Operating Procedure
Each of the eight channel modules can communicate with sensors by two RS-485 lines with
MODBUS addresses from 1 to 16, and transmit information to the central processor unit (CPU)
on the concentration and the state of each of the sensors.
The sensors are connected to the module via two separate lines or in a "ring" in accordance with
the requirements of the project. The module supports connection of up to eight sensors on each
RS-485 line and provides power supply for one sensor for each channel. When you connect to
UPES more than 16 sensors, they must be fed from a separate power supply of + 24V.

One port — communication with sensors via an independent port, 16 sensors
(MODBUS address from 1 to 16) can be connected to the port. The state of the
sensors connected to the port is displayed on the first relay set;

Hot swap —communication with the sensors through the first port. In case of
failure of the first port communication is transferred to the second port (MODBUS
address from 1 to 16). When you activate the first port the communication is
restored in the initial mode;

Ring — communication with sensors via the first port, where the ring integrity is
controlled. When the ring is open, communication between the primary transducers
is performed via two ports (MODBUS address from 1 to 16);

Two independent ports — communication with the sensors via two independent
ports, 8 sensors can be connected to each port. The state of the sensors connected to
the first port is displayed on the first relay set and the state of the sensors connected
to the second port — on the second relay set. The first MODBUS port: 1-8, the
second MODBUS port: 9-16.
The module has two relays on the output with "dry" contacts (relay of first and second threshold)
for each channel.
The boards generate the signals for L3 threshold and Fault relay that are common for all UPES,
the "Fault" LEDs lit up individually for each board of the connected primary transducers of the
RS-485 lines , in case of the sensor failure. Two-channel boards have LED status indication of
the RS-485 lines and continue their work in the absence or failure of the CPU. The channel
module at first-time start-up receives from the CPU the internal number, in accordance with the
location in the UPES enclosure.
For each primary detector the user assigns the MODBUS addresses which are connected to odd
(1-8) and to even (9-16) channels. The CPU remembers the numbers of the boards and the
MODBUS addresses of the sensors connected to each port and when the power is turned off or
lost (failed) recovers the device configuration. To search for sensors and system initialization
assign MODBUS addresses to the sensors from 1 to 16 for each channel board.
The CPU controls the entire block, display, transfers the RS-485 information to the "top level"
on concentration and the state of each of the sensors connected to each channel board. CPU is
controlled with the keyboard, located on the front panel, as well as using the command and
address registers from your PC.