The ModBUS Slave service has two functions, one of these is to allow remote access to the Protege System Controller from an Industrial Process Control solution or SCADA (System Control and Data Acquisition) System, the other is to allow an Industrial Process, PLC or other device to generate reportable actions within the Protege System Controller (Zone Activation) making reporting of plant and equipment alarms a very simple process.
To program the ModBUS slave service ensure that the service that has been selected is halted. Press the [ENTER] key until the display shows the service type selection screen.
SV001 Ser Type ModBUS (Slave)
Use the [1] and [3] keys to scroll the service types until you reach the ModBUS slave selection and press [ENTER] to select the ModBUS slave type displayed and proceed to the next programmable option for the ModBUS slave service. For more information about the list control data entry refer to the section List Control Data Entry (see page 335).
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The ModBUS Slave Service may require the RS232 serial interface to be converted from a RS485 Signal. Ensure the correct interface is used when interfacing to the Protege System Controller and PRT-COMM. Refer to the communication PRT-COMM installation manual and ACC-485-ISO documentation.176
PRT-CTRL-SE Protege System Controller Reference Manual | PRT-CTRL-SEService Mode
The service mode determines how this service operates with the system controller. By default a service is set to start with the operating system. Setting a service to "Start With The Operating System" (Start With O/S) allows the service to operate automatically, if the system controller is reset or restarts. Manual control of the service can be set by using the Manual option for the service mode.
SV001 Ser Mode Start with O/S
Use the [1] and [3] keys to scroll the available operating modes and press [ENTER] to select the operating mode displayed. For more information about the list control data entry refer to the section List Control Data Entry (see page 335).
Communications Port Number
The communications interface port defines which serial port the controller will use for communication with the ModBUS Master Controller or SCADA application. Select the communication port that will be plugged in to the ModBUS connection.
SV001 Port Ext Port 1
Use the [1] and [3] keys to scroll the communication ports and press [ENTER] to select the operating mode displayed. For more information about the list control data entry refer to the section List Control Data Entry (see page 335).
Communications Port Speed
The communications port speed defines the baud rate at which the ModBUS service will operate. The default value for ModBUS is 9600 bits per second. If the speed or configuration is different adjust this setting to suit the ModBUS master configuration.
SV001 Speed 9600
Use the [1] and [3] keys to scroll the communication port speed options and press [ENTER] to select the speed displayed. For more information about the list control data entry refer to the section List Control Data Entry (see page 335).
Communications Port Parity
The communications port parity defines the parity configuration for the communication with the ModBUS master. This will default to Even Parity however this can be adjusted to suit the ModBUS master configuration.
SV001 Parity Even Parity
Use the [1] and [3] keys to scroll the communication parity options and press [ENTER] to select the parity displayed. For more information about the list control data entry refer to the section List Control Data Entry (see page 335).
PRT-CTRL-SE Protege System Controller Reference Manual | PRT-CTRL-SE
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Device Address
When the unit is connected to a ModBUS communication network it must have a device address programmed.
The device address is typically provided by the automation company or defined by the SCADA system that is being connected to. The address is programmed in Hexadecimal and can not be 0x00 or 0xFF.
SV001 Device address: 01
Type the appropriate 2 digit device address, after each digit you must press [Í] and [Î] to move to the next digit. When the desired device address is entered, press [ENTER] to save the programmed setting and move to the next screen. For more information about hexadecimal data entry refer to the section Hexadecimal Data Entry (see page 335).
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The device address must be configured for a value below 0xFF and above 0x00, failure to configure the address to an appropriate value will cause the system not to respond. Duplicate address will cause communication failures with the ModBUS Master application.Data Options
The data configure various communication settings that affect the operation of the ModBUS protocol.
SV001 Data [---]
To modify options, use the keypad as explained in section Entering Data Options (see page 336).
Option 1 – Log Comm Events
y Enabled the service log communication events that occur on the ModBUS system to the event buffer.
y Disabled the communication events will not be logged.
Option 2 – Log Comm Errors
y Enabled the service log ModBUS Communication errors that occur which relate to the requests of certain objects and information outside the bounds of the interface.
y Disabled the errors will not be logged and requests that generate errors will be silently discarded.
Option 3 – Reserved
y Reserved do not modifyOption 4 – Reserved
y Reserved do not modifyOption 5 – Remote Buffer View
y Enabled the service will use the remote buffer for the look up of register values. This is used when the Protege System Controller is used to receive alarms and messages from remote sites that communicate in the Remote ModBUS protocols.
y Disabled the service will use the local objects (Areas, Doors and Zones) to send status and information.
Option 6 – Remote Zone Write
y Enabled the service will allow specific coil address's to interact with the zones on the system. The zones start on the first zone expander. This setting allows remote SCADA applications to activate alarms in the Protege System Controller and report these messages to a standard alarm monitoring station.
y Disabled the coil address's will operate there designated device.
Option 7 and 8 - Reserved
y Reserved do not modify178
PRT-CTRL-SE Protege System Controller Reference Manual | PRT-CTRL-SEFail To Poll Time
The fail to poll time allows a timer to be triggered on each successful poll from the ModBUS Master. When this timer expires the Fail To Poll PGM output will also be activated.
SV001 Poll fail time: 120 secs
To modify the poll fail time (000 to 255, a setting of 000 will result in the default of 120 seconds being used), use the keypad as explained in section Entering Decimal Numbers (see page 333) and press [ENTER].
Fail To Poll PGM Output
The fail to poll PGM output is activated when the ModBUS service poll fail timer expires and is deactivated when the ModBUS service completes a valid communication. This PGM setting can be used to trigger an audible alarm or other indication that ModBUS communication has failed to operate.
SV001 Poll fail pgm: --000:00
To modify the poll fail PGM, use the settings as explained in section Entering PGM and PGM Groups (see page 336).