Delta RMC151 User Manual
Page 697
7 Hardware
The Enable Output will turn off when an Direct Output Halt occurs, unless the Direct Output
status bit already was on.
The modules listed below have an Enable Output.
RMC70 RMC150
MA
AA
QA
Configuring the Enable Output
The user can configure the behavior of this output with the Enable Output Behavior
parameter. The parameter has the following two choices:
•
Active Closed - When the Enable Output is set, the Enable output switch is closed.
•
Active Open - When the Enable Output is set, the Enable output switch is opened.
Wiring
The Enable output is a solid state relay (SSR). When it is off, it has high impedance, and
when on it has low impedance (10 Ω maximum). Because the Enable output is isolated,
the user must power it externally. The maximum current and voltage for the Enable
output is 100 mA and 30 V.
The Enable output has a + and - connection. Both lines must be connected for the output
to function. Because both sides of the output are provided, the switches may be
independently connected in a high side or low side configuration (that is, with the load
(input) on the source or sinking side of the output). See the wiring diagrams below.
To TTL input (high = enable):
To active low Enable input:
Using Outputs with Inductive Loads
External fuses should be used to protect the SSRs if there is a possibility of over-current.
When switching inductive loads, it is important to place a diode or tranzorb across the
load to protect the switch when transitioning from an “ON” to an “OFF” state. Otherwise,
the collapsing magnetic field can cause a reverse voltage spike in excess of the 30 V
rating of the SSR. See the D8 Wiring or RMC150 Discrete I/O Wiring topic for examples.
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