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▪ TB2
This terminal block accepts input numbers nine through 16.
▪ TB3
This terminal block accepts input numbers 17 through 24.
▪ TB4
This terminal block accepts input numbers 25 through 32.
Terminal blocks TB1 – TB4 protrude through the rear panel of the M9000 module and connected
directly to the field status circuits.
The board mounting blocks are used to attach the board to the chassis rear panel and are also
utilized as the electrical connection to ground the high-voltage surge suppression capacitors (See
Warning immediately below).
Warning: Equipment damage will occur if joints are not mechanically tight. Surge capacitors
must be grounded through mechanical joints between the circuit board mounting
blocks and the chassis rear panel.
• LOW-VOLTAGE DIGITAL BOARD (FIRST GENERATION)
This generation is no longer used in new construction. It has been superseded by the second
generation digital input assembly. This board contains optical isolators and is used to monitor the
signals from the High-Voltage Digital board and provide digitized data to the CPU board.
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