G&L MMC-A2, Hardware Manual

Page: 74 / 192

Standalone MMC Control
66 MMC Hardware Manual G & L Motion Control Inc.
4.7.1.2 Axis I/O Port DC Input
Each Axis I/O Port provides one 24 Vdc input. Each
input is an optically isolated solid state switch. It turns
on or off according to the logic state sent to it by the
CPU. When the switch turns on, current flows through
the switch. When the switch turns off, current flow
stops.
These outputs are intended to interface with the drive
enable and drive reset inputs. When an output is turned
on current can flow through the switch in either
direction. This allows the outputs to be connected in a
sink or source configuration. One of the input pins
should be connected to 24 Vdc or COM. The
remaining input pin should be tied to the input signal
that will be switching. Refer to
Figure 4-11 .
For safety reasons, all outputs turn off (no current flow)
when a scan loss condition occurs.
For more information on DC input operation, refer to
Section A.2 on page 171 of Appendix A .
Figure 4-11: Axis I/O Port DC Input
MMC Axis I/O Connector Drive
Drive Ready
DC IN+
DC IN -
6
7
COM
+24V