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No, you do not need to supply a 24vdc connection to 1L+. Signal 1L+ is located on Row 1, terminals 11 and 12 and Row 2, terminals 1 to 8, all of which are internally connected. The 170ARM37030 will provide a 24vdc output for use with the 24vdc field input devices. This 24vdc source is derived from the 120vac module power and provides up to a maximum of 100ma @24vdc. An optional external 24vdc power supply can also be used to power the field side input devices.When using an external 24vdc source, its return or common must be connected to Row 1, terminals 13 or 14 (M-)