S&2ð
cod. Carel +030221826 rel. 2.0 dated 03/10/02
6
+$5':$5(6758&785(
The structure of the Carel pCO
2
features:
• theS&2
FRQWURO, fitted with a 16-bit microprocessor for running the regulation program, and the set of terminals required
for connection to the controlled devices (for example: valves, compressors, fans). The program and the set parameters are
saved permanently in )/$6+ PHPRU\, preventing data loss in the event of power failure (without requiring a back-up
battery).
The pCO
2
also allows connection to a local pLAN network made up of a series of pCO² and terminals. Each board can
exchange information (any variable, digital or analogue, according to the application software) at high transmission speeds.
Up to 32 units can be connected, sharing information in very short times. The connection to the supervisor/telemaintenance
serial line, based on the RS485 standard, is made using the optional serial boards (PCO2004850) and the Carel
communication protocol.
• the WHUPLQDO also managed by microprocessor, fitted with display, keypad and LEDs to allow the programming of the
control parameters (Set Point, differential band, alarm thresholds) and fundamental operation by the user (ON/OFF, display
of the controlled values, optional printing). The terminal does not have to be connected to the pCO
2
for normal operation, but
can be used for the initial programming of the fundamental parameters.
The power of the application software means that the user terminal allows:
• the initial programming of the machine, with password-protected access to guarantee security;
• the possibility to modify, at any time, the fundamental operating parameters, optionally protected by password;
• the display and acoustic signalling (buzzer) of the alarms detected;
• the display of the active functions, using the LEDs;
• the display of all the quantities measured;
• the printing of the alarms recorded, and the periodical printing of the status of the main machine variables (optional);
• the possibility to simulate the function buttons of the standard keypad, with LED indication of the selected function
(depending on the application software);
the possibility to simulate a numeric keypad on the standard keypad, for setting the data (depending on the application software)
.
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