P3F - Pakscan Master Station Technical Manual
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Publication S703E V1.1
Issue 06/09
The Option card settings relate to the option card fitted in the option 1 slot. The Pakscan 2 Loop option
card may only be fitted in this slot and must not be fitted in slot 2. It controls the actuators and field
units over a two wire cable wired in a ring or loop, visiting each actuator in turn. The data signal is a
modulated 20 mA current and the system includes automatic cable failure protection.
Masterstation Configuration
Site Name
: A text field in which a description of the site can be entered for
identification purposes.
Tag Name
: A text field in which a tag identifier for this particular master station on the
site can be entered.
Option 1
: A numeric field for the address number. This is the address used to access
Modbus Address the Pakscan 2 option card and master station.
The default value is 240 and it is recommended that this is changed to
avoid conflict with any new system added.
ESD Settings
: These four drop down boxes can each be set to ‘Enable’ or ‘Disable’ the
related Emergency Shut Down signal, depending on the particular site
requirements.
In general the settings should be ‘Disabled’ unless the particular
Emergency Shut Down function is required. The action for each individual
actuator has to be set locally on the actuator to either close, open or stay
put (no movement on receipt of the ESD signal) as required for each valve;
refer to individual actuator manuals.
Command
: These four drop-down boxes can each be set to ‘Enable’ or ‘Disable’ the
Settings
host system commands to the actuators and field units from the indicated
source of the signal. For example, commands over the Ethernet connection
can be disabled, whilst those from Serial Port 1 can be enabled.
Ethernet commands are those sent via the Ethernet ports from the host
system using Modbus TCP.
The Webpage is the system currently being used to set up the system.
Commands on the individual field unit pages can be disabled by this
setting.
Serial Port 1 and Serial Port 2 are the RS232/RS485 Modbus RTU ports,
which are commonly used for control and monitoring.
Number of
: This value is fixed at 32 and indicates the maximum number of actuators or
Channels
field units that can be connected to this system.
Software Version : The version of software fitted to the CPU module.
Controls
Print Page
: Prints the settings to a printer attached to the PC.
Save Settings
: Saves the settings to the master station CPU module. Until they are saved
any alterations to the settings will not take effect.
Pakscan 2 Loop Option
Software Version : The version of software fitted to the Pakscan 2 Loop option module.
Highest FCU
: This text box contains the setting for the highest address used for an
actuator (or field unit) on the two wire loop. The Pakscan 2 Loop card polls
all field units up to this highest address. The loop scan time is minimised by
restricting the polling to only those field units that should be present and
