IS410TBCIS2C |GE IS400TBCIS2CEE TBCI Terminal Board

The IS400TBCIS2CEE Contact Input with Group Isolation (TBCI) terminal board accepts 24 dry contact inputs wired to two barrier-type terminal blocks. For contact excitation, dc power is wired to TBCI. The contact inputs have noise suppression circuitry to protect against surge and high-frequency noise.

Connect the wires for the 24 dry contact inputs directly to two I/O terminal blocks on the terminal board. These blocks are held down with two screws and can be unplugged from the board for maintenance. Each block has 24 terminals accepting up to #12 AWG wires. A shield terminal strip attached to chassis ground is located immediately to the left of each terminal block.

In a Simplex system, connect the I/O pack into the TBCI connector JR1. In a Dual system, plug the I/O packs into JR1 and JS1. In a TMR system, plug the I/O packs into JR1, JS1, and JT1. The I/O pack(s) attach to side-mounting brackets. One or two Ethernet cables plug into the I/O packs. Connect TBCI to the contact excitation voltage source using plugs JE1 and JE2.

GE TBCI Compatibility:

Discrete input voltage signals pass to the I/O pack, which sends them through optical isolators providing group isolation, and transfers the signals to the controller. The reference voltage in the isolation circuits sets a transition threshold that is equal to 50% of the applied floating power supply voltage. The tracking is clamped to go no less than 13% of the nominal rated supply voltage to force all contacts to indicate open when voltage dips below this level.

A pair of terminal points is provided for each input, with one point (screw) providing the positive dc source and the second point providing the return (input) to the board. The current loading is 2.5 mA per point for the first 21 inputs on each terminal board. The last three have a 10 mA load to support interface with remote solid-state output electronics. Contact input circuitry is designed for NEMA Class G creepage and clearance.

TBCI Diagnostics:

Diagnostic tests to components on the terminal boards are as follows:

• The excitation voltage is monitored. If the excitation drops to below 40% of the nominal voltage, a diagnostic alarm is set and latched by the I/O pack.

• YDIA I/O pack performs periodic self test of all contact inputs. In a alternative sequence each contact is forced open or closed and reads the status, if any contact fails the test a fault is created.

• If the input from this board does not match the TMR voted value from all three boards, a fault is created.

• Each terminal board connector has its own ID device that is interrogated by the I/O pack. The connector ID is coded into a read-only chip containing the board serial number, board type, revision number, and the JR1/JS1/JT1 connector location. When the chip is read by the I/O pack and a mismatch is encountered with what is configured in the ToolboxST application, a hardware incompatibility fault is created.