You can use a half-duplex serial connection to connect multiple MODBUS Slave devices to the AADvance controller. To make the physical connection, do the following:

1. Select an applicable cable. We recommend 3-pair, overall shielded cable.

2. Remove the serial port connector from the T9100 processor base unit.

3. Make the connections shown in the illustration. Terminate the twisted pairs with a 120 Ω resistor in series with a 68 nF capacitor at the receiver ends.

4. Connect the signal ground (not illustrated) from the 0 V terminal to the slave device.

5. Insert the connector into the T9100 processor base unit.

System Security

Serial networks are closed and local and have limited protocol functionality, so they are immune to any external attack apart from local deliberate sabotage. The AADvance system, however, with its computers and DCS interfaces, uses Ethernet networks which are frequently part of a larger corporate network and can expose the system to accidental or malicious infection or attack.

These steps help prevent such issues:

• Consider network and computer security, for example:

• The AADvance system must not be on a network with open unsecured access to the Internet.

• The Firewall must be active on the computer, helping prevent access to the relevant Ethernet ports on each communication interface. Antivirus software must be installed and be kept up-to-date.

• The computer must be password-protected. If using a laptop, keep the laptop locked when not in use.

• If the software uses a hardware license USB dongle, keep the USB dongle secure. The software will not run without the USB dongle.

• The application must be password-protected.

• Removable media, such as USB storage devices and CDs, must be virus checked before use in the system.

Connecting Field Wiring

Connect the field wiring to the screw terminal blocks on the termination assemblies.

Use conductor wire with a cross section of 16 AWG. The stripping length should be 6mm (1/4 in.) and a conductor temperature rating of 85 ºC. Apply a tightening torque of 0.5 Nm (0.37 ft. lb.) to the terminal screws.

Digital Input Field Loop Circuits

This section contains recommended field loop circuits for line monitoring digital inputs used in Emergency Shutdown or Fire & Gas applications.

Digital Input Slew Tolerance

It is possible during sustained periods of abnormal input voltage slewing that channels can be declared faulted as a consequence of diagnostics otherwise designed to verify that the channels are operating within their designed safety accuracy.

To avoid spurious declaration of channel faults it is necessary to ensure that the input signal condition satisfies the maximum slew rate criteria defined in the Solutions Handbook. Accordingly it may be necessary to condition the input signal such as by filtering or by appropriate choice of process safety time.

Analogue Input Field loop Circuits

These circuits can be used for simplex, dual and triple configurations of analogue input modules. Fit a fuse (as shown) in each circuit to protect the field wiring.

The recommended field loop circuits for analogue inputs are as shown below.

It is possible during sustained periods of abnormal input current slewing that channels can be declared faulted as a consequence of diagnostics otherwise designed to verify that the channels are operating within their designed safety accuracy

To avoid spurious declaration of channel faults it is necessary to ensure that the input signal condition satisfies the maximum slew rate criteria defined in the Solutions Handbook. Accordingly it may be necessary to condition the input signal such as by filtering, sensor slew rate configuration or by appropriate choice of process safety time.

Recommended Field Circuit for Digital Outputs

This circuit is applicable for simplex and dual configurations of digital output modules. The two 10 A fuses shown are included on the termination assembly within the controller. The 5 A fuses satisfy UL508 requirements for digital output field supplies, see illustration below:

The 10A fuses are fitted into the termination assembly and are:

• T9902: SMF Omni-Block, Surface Mount Fuse Block 154 010, with a 10A, 125V Fast Acting Fuse, Littelfuse.

It is possible during sustained periods of abnormal input current slewing that channels can be declared faulted as a consequence of diagnostics otherwise designed to verify that the channels are operating within their designed safety accuracy.

To avoid spurious declaration of channel faults it is necessary to ensure that the field supply voltage and output signal condition satisfies the maximum slew rate criteria defined in the Solutions Handbook. Accordingly it may be necessary to condition the field supply voltage or output signal such as by filtering or by appropriate choice of process safety time.

Recommended Circuit for Analogue Outputs

These circuits are suitable for simplex and dual configurations of analogue output modules. All channels are isolated from each other but may be bridged at the ‘+’ terminal if fed by a common system mounted supply.

The above circuit is appropriate for devices that are powered by the system. The channel will pass a requested current between 0mA and 24mA. The field device could also be connected between the 24V supply and the Loop Plus terminal

The above circuit is appropriate for devices that are powered locally and expect a current-controlled signal loop. Ensure that the loop is wired to pass current to the Loop Plus terminal and return it on the Loop Minus terminal.

Analogue Output Slew Tolerance

Analogue output channels voltage slew is unconstrained with the limits set by the module’s compliance operating voltage range.

To avoid spurious declaration of channel faults it is necessary to ensure that the field supply voltage and output signal condition satisfies the maximum slew rate criteria defined in the Solutions Handbook. Accordingly it may be necessary to condition the field supply voltage or output signal such as by filtering or by appropriate choice of process safety time.

This diagram shows the T9882. The T9881 has the same terminal arrangement.

Install Modules

The modules of the AADvance controller mount onto the base units. The processor module(s) mount onto the T9100 processor base unit, while the various I/O modules mount onto the T9300 I/O base unit and associated termination assemblies.

The product range includes two sizes of blanking covers to conceal unused module positions. The shorter cover is for a spare position on the processor base unit, while the taller coveris for a spare position on an I/O base unit.
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