An insert goes between the inside and outside surface of the hinged door. The
surface towards the inside of the module (when the hinged door is closed) has circuit wiring
information, and circuit identification information can be recorded on the outside surface. The
outside left edge of the insert is color-coded blue to indicate a low-voltage module. This
module can be installed in any I/O slot in a Series 90-30 PLC system.
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