User's Manual

E2 Wireless I/O Page 23
Digital Outputs (Pulsed Outputs)
Digital outputs are open-collector transistors and are able to switch loads up to 30VDC,
200mA.
The 8 digital outputs share the same
terminals as the digital input. These
terminals are marked DIO1-8.
When active, the digital outputs provide a
transistor switch to EARTH (Common).
To connect a digital output, refer to the
diagram across. A bypass diode is
recommended to protect against switching
surges for inductive loads such as relay
coils.
The digital channels DIO1-8 on the E2
module can be used as pulse outputs with a
maximum output frequency of 10KHz.
As well as indicating the Digital Output status (on / off), the LEDs can also indicate a
Fail Safe status by flashing the Output LED. This feature can be utilised by configuring
a Fail Safe time and status on the “I/O Configuration” web page as shown below.
The output will reflect the status on
the input which is done using a
Change of State message and an
update message. We use these
update messages to establish if the
Output has not been updated and
can then trigger the Fail Safe State.
The output expects to receive an
update message at a regular interval
and if it fails to receive this message
after the said time can then activate
the Fail Safe State. The Fail Safe
Time is the time the output needs to
count down before activating the Fail
Safe state.
The recommend time configured should be a little more than twice the update time of
the input that is mapped to it.
This is because the countdown is restarted whenever it received an update so if we
send two updates and fail to receive both we can then put the output into a Failsafe
state.