Omron C-series manual Link Adapter Repeater Input

Link Adapter Repeater Input Section 2-6

2-6 Link Adapter Repeater Input

Link Adapters AL002-(P)E and AL006-(P)E have repeater input terminals. They are used when it is necessary to be sure that power has already been turned on in a system connected to a branch line of the Link Adapter before signals are transmitted along the main line. They should be kept connected (ON) when not needed. When they are connected across, signals are relayed along the Link Adapter's main line. Once main line transmission has started, signals will contin- ue to be relayed even if the repeater input terminals are opened (OFF).

Link Adapter

Main line

Link Adapter AL002-(P)E or AL006-(P)E

Relay input

Branch line

Main line

Link Adapter

Master

Branch system

Terminator

Units which may be connected to a branch line (as is branch system above)

Units with repeat input terminals (I/O Link Units)

Branch		To the repeater input
	line

Repeater output

Connect the Link Adapter's repeat input to the I/O Link Unit's repeater output.

Units without repeater input terminals (Units other than I/O Link Units)

X

Branch line

Relay

X

Power source

Connect so that the repeater input sill be ON when power is turned on in the Unit connected to the branch line (in this case a Remote I/O Slave).

If the repeater input is connected across directly (not used) in the above exam- ple, control system operation will begin when the Master detects the terminator, even if power to the branch system is off. In other words, the branch system is ignored. The repeater input is used to prevent this from happening. When the repeater input is connected as shown above, then the Link Adapter's main line will not transmit data as long as power is not turned on in the branch system, thereby preventing the entire system from starting. Once the branch system is operating normally, however, signals will continue to be transmitted along the main line even if the repeater input turns OFF.

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