Zeta Alarm Systems.
Classic 2000 Mk II Operation Manual
Revision 1.0
Part # MAN-Z3K-01
Page 25
2.5 Installing SLC Devices
Communications Loop Performance Chart
Fault Condition
Style 4 (two-wire) Loop Operation
(meets NFPA 72 Style 4 requirements)
Style 6 (four-wire) Loop Operation
(meets NFPA 72 Style 6 requirements)
(3) Style 7 (four-wire) Loop Operation
(meets NFPA 72 Style 7 requirements)
Notes:
1. Trouble indicates a trouble signal will be generated at the control unit display during the abnor-
mal condition.
2. Alarm Capability indicates an alarm signal can be transmitted to the control unit during the
abnormal condition.
3. Loop operation meeting Style 7 requirements isolates entire physical zones on the communi-
cations loop from faults that occur within other areas of the loop.
4. Refer to the installation drawings supplied with each SLC device for rating and specification
information.
Single Open
on Loop
Single Ground
on the Loop
Shorted Loop
Loop Shorted
and Opened
Loop Shorted
and Grounded
Loop Opened
and Grounded
(1) Trouble
(2) Alarm
Capability,
Trouble
Trouble
Trouble
Trouble
Trouble
Alarm
Capability,
Trouble
Alarm
Capability,
Trouble
Trouble
Trouble
Trouble
Alarm
Capability,
Trouble
Alarm
Capability,
Trouble
Alarm
Capability,
Trouble
Alarm
Capability,
Trouble
Trouble
Alarm
Capability,
Trouble
Alarm
Capability,
Trouble