Carel mRack - Supervisor Network

µRack
Cod. CAREL +03P220431 rel. 0.0 del 08/09/05 - preliminary version
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8. The supervisor network
µRack can be connected to the most common supervisory systems, using suitable interface boards and protocols.
In particular, the following data is exchanged with the supervisor:
• The status of the inputs /outputs
• The status of the devices enabled
• Alarms present and active
• Enabling of the devices, various settings etc.
In addition, this function allows the possibility to modify a series of parameters from the supervisor, such as: set point, differentials, times, unit status, reset alarms
etc. Also see the paragraph Supervisor communication variables.
8.1. Serial boards
For connection to supervisory systems, the control uses the standard Carel RS485 serial protocol.
Serial connection options:
Product code RS485 serial option
Code
Notes
MRK0000000 MCH2004850 External option connected by cable to µRack compact
MRK00000D0 FCSER00000 Serial output board for DIN version, to be fitted in the instrument
MRK0000AD0 ---------------- µRack with serial option FCSER00000 already FITTED by Carel
8.2. Communication protocols.
Communication protocol: CAREL.
To enable the correct operation of the communication protocol, as well as installing the board, a number of parameters need to be set, such as the identification
number (parameter /36).
Each controller must have the address set so that:
• There are NO other devices with the same address on the same serial line
• The addresses on the same serial line must be set in progressive order, starting from 1.
For further information, refer to the corresponding manual or contact CAREL.
9. User interface
The parameters are divided into 2 categories.
Display information that is NOT password-protected: show the values of the probes, alarms.
Display information that is password-protected:
1. USER parameters (password 22 modifiable by parameter /40): set the main functions of the devices connected (times, set points, differentials);
2. INSTALLER parameters (password 44 modifiable by parameter /41): periodical checks on the devices, calibration of the probes connected, manual
operation of the devices.
3. MANUFACTURER parameters (password 77 modifiable by parameter /42): configure the compressor rack, enable the main functions and select the
devices connected.
Once the password is entered, it remains in the memory until automatically returning to the main screen, so as to make it easier to move around within the same
level of protection.
IMPORTANT:
To change the level of parameter protection from the keypad (from the MANUFACTURER level only), proceed as follows:
1. Once having entered the correct PWD MANUFACTURER, the system displays the string “S-P” (Set Parameters);
2. Then either press “SEL”, directly accessing the parameter menu to change the values or press “DOWN” or “UP” to display of the string “L-P” (Level-
Parameters).
3. If modifying the level, pressing “SEL” accesses the parameter menu as described, where parameters are scrolled no longer displayed with the
associated value, but rather the level of protection.
4. Using the same procedure as for modifying the parameters, change the level, choosing between the 3 possible levels available:
“_U_” :parameters visible at User level,
“_I_” :parameters visible at Installer level,
“_C_” :parameters visible at Manufacturer level.
10. List of parameters
This table contains the list of all the parameters, with the corresponding description.
Parameter: description;
Type: (R) read-only, (R/W) read/write;
Pos.: position: USER-INSTALLER-MANUFACTURER;
Description: synthetic description of the parameter;
UOM: unit of measure of the value in question;
Range: range of possible values for the parameter;
Default: factory-set value of the parameter.
Notes: column available for user notes.
IMPORTANT: Not all the screens listed below will be displayed when scrolling the display; enabling a certain type of configuration will mean that new screens are
displayed that were previously not available. The display therefore depends on the initial configuration!