LINK Systems System 2500 PLS - Manual (Page 57)

System 2500 Operating & Installation Manual - Revision 07 3-1
Section 3 OUTPUTS
The PLS-2500 system is available with a minimum of 8 outputs and a maximum of 16 outputs.
These are provided in groups of eight on circuit boards which are mounted on the cover of the
Logic Unit. Each group of eight outputs can be relays, DC solid state modules, or AC solid state
modules.
3.1 Relay Outputs
Each relay output board provides eight relays for the user. The first two relays on any board (i.e.,
outputs 1 and 2 on the board containing outputs 1 through 8) provide two sets of SPST contacts
which are brought out to the terminal strip on the output connector panel. One set of contacts is
normally open (labeled CO and NO) and the other set is normally closed (labeled CC and NC).
For the remaining six output relays the contact arrangement available to the user for each relay is
one set of SPDT contacts. The three terminals in this arrangement are normally closed, normally
open, and a common. These are brought out on the terminal strip of the output board connector
panel and are labeled NC, NO, and C. For either type of contact arrangement, programming a
relay to turn 'ON' through the OIT will cause the relay to energize and close the normally open
contacts.
The outputs for the standard relay board are rated to carry 5 amps at 120 VAC or 24 VDC.
3.2 DC Solid State Outputs
Each solid state output board provides eight solid state relays for the user. There are two output
terminals provided for each DC solid state output which operate similarly to a set of normally
open contacts on a relay. When the output is programed to turn 'ON' using the OIT, then current
can conduct from the '+' terminal to the '-' terminal (as labeled on the output terminal block).
The outputs for the DC solid state relay board are rated to carry 3 amps at 60 VDC.
3.3 AC Solid State Outputs
There are two output terminals provided for each AC solid state output which operate in the same
manner as a set of normally open contacts on a relay. When the output is programed to turn 'ON'
using the OIT, then the path between its two output terminals will conduct current. There is no