Monarch Instrument DC 2000 - Manual (Page 104)

Page 5-38
Chapter 5 Programming
5.9 DIGITAL I/O
The Digital I/O (Relay Outputs, Optocoupled inputs) option must be fitted in order for the following to work. If you do
not have the option fitted you should ensure that all inputs are programmed off. To turn event messages off set the
message to “” (null). The Digital I/O menu selection in the Program Menu, allows the user to select what type of
signal opens the output contacts and what function the input signals will perform. The user can also program
custom event messages. The following programming options are available from the Digital I/O Menu:
Contacts Out - Allows the user to select what type of signal controls the Contact Out relays.
Switches In -
Allows the user to select a Function for the switch to activate.
Event msgs - Allows the user to enter custom messages for events.
5.9.1 Contacts Out
This menu contains four options as follows:
* Alarms clear Opens the Contacts Out when the alarms are cleared (default), else they remain latched.
* ACK key Opens the Contacts Out when the ACKnowledge Key is pressed.
* Failsafe Allows the Contacts Out to function as Failsafe Contacts. Reverses the logic so a
contact which is normally OPEN will be energized. This will drop out in the event of a
power failure and indicate an alarm.
* Reflash Programs the Contacts Out to momentarily open and reclose each time an additional
alarm is acquired, which is programmed to close the contacts.
To program the Contacts out, use the UP ( ↑) or DOWN (↓) Arrow Keys to highlight “Contact outs”. Press
ENTER to invoke the Contact Outs Menu and the following options are available.
5.9.1.1 Alarms Clear
Use the UP (
↑) or DOWN (↓) Arrow Keys to highlight “Alarms clear” and press ENTER. The display will
read either “opn clr=NO”’ or “opn clr=YES” (default). Use the YES or NO key to select whether the contact
outs should open when the alarms are cleared, “opn clr=YES” or not open, “opn clr=NO”. When the
desired selection is displayed, press ENTER and the display returns to the “Alarms clear” menu item. To
make the outputs latching, set Alarms Clear to NO and ACK key to yes.
5.9.1.2 ACK Key
Use the UP (
↑) or DOWN (↓) Arrow Keys to highlight “ACK key” and press ENTER. The display will read
either “opn ack=NO”’ or “opn ack=YES”. Use the YES or NO key to select whether the contact outs
should open when the ACK Key is pressed, “opn ack=YES” or not open, “opn ack=NO”. When the desired
selection is displayed, press ENTER and the display returns to the “ACK key” menu item.
NOTE: The ACK button position, top left corner of the screen is always active, so even though the ACK
button is not blinking, the contacts can still be reset by pressing this area of the screen.
5.9.1.3 Selecting and Programming Failsafe
Use the UP (
↑) or DOWN (↓) Arrow Keys to highlight “Failsafe” and press ENTER. The display will read
either “flsafe=NO”, or “flsafe=YES”. Use the YES or NO key to select whether the contact outs should be
Failsafe or not Failsafe. When the desired selection is displayed, press ENTER and the display returns to
the “Failsafe” menu item.