Data Sheet: 500 Series Intelligent Modules

500 Series
Intelligent Modules
The System Sensor intelligent module products are
designed to meet a wide range of applications.
• SEMS screws for easing wiring
• Panel controlled status LED (except M501M)
• Analog communications
• Rotary address switches (except M500X)
• Low standby current
• Mounts in standard 4˝ junction box
Monitor and control modules can be used to supervise and
activate sounders, strobes, door closers, pull stations, waterflow
switches, conventional smoke detectors, and more. Each module
is rigorously designed and tested for electromagnetic compatibility
and environmental reliability, in many cases exceeding industry
standards. Modules are addressed with easy-to-use rotary
code switches. Full size modules mount in standard 4 in × 4 in
× 21⁄8 in junction box. Wiring terminals are easily accessible for
M500M Monitor Module, M501M Mini Monitor Module,
and M500DM Dual Input Monitor Module
System Sensor monitor modules provide an interface to contact
devices, such as security contacts, waterflow switches, or pull
stations. M501M and M500DM are capable of Class B supervised
wiring to the monitored device. M500M is capable of Class A
supervision. Conventional 4-wire smoke detectors can be monitored
through their alarm and trouble contacts, wired as an initiating loop
to the module. In addition to transmitting the supervised state of the
monitored device (normal, open, or short), the full analog supervision
measurement is sent back to the panel. This allows detection of
impedance changes in the supervised loop to the monitored device.
The M500DM module is capable of monitoring two separate Class B
circuits simultaneously, making it ideal for waterflow tamper switch
and flow switch monitoring. The compact size of the M501M module
allows it to fit inside devices or junction boxes behind devices.
Agency Listings
M500X Isolator Module
The M500X Isolator Module is an automatic switch that opens when
the line voltage drops below four volts. Isolator modules should be
spaced between groups of sensors or modules in a loop to protect
the rest of the loop. If a short occurs between any two isolators, then
both isolators immediately switch to an open circuit state and isolate
the devices between them. The remaining units on the loop continue
to fully operate. The number of devices that can be installed between
isolator modules varies depending on the device type. Please see
your module's manual for more information.
M502M Zone Interface Module
The M502M Zone Interface Module allows intelligent panels to
interface and monitor 2-wire conventional smoke detectors. All
2-wire detectors being monitored must be UL or ULC compatible
with the module. The M502M module is addressed through the
communication line of an intelligent system. It transmits the status of
one zone of 2-wire detectors to the fire alarm control panel. Status
conditions are reported as normal, open, or alarm. The interface
module supervises the zone of detectors and the connection of the
external power supply.
M500S Control Module
The M500S Control Module provides supervised monitoring of wiring
to load devices that require an external power supply to operate,
such as horns, strobes, or bells. It is capable of Class A and Class
B supervision. Upon command from the control panel, the M500S
module will disconnect the supervision and connect the external
power supply across the load device. The disconnection of the
supervision provides a verification to the panel that the control
relay actually turned on. The external power supply is always relay
isolated from the communication loop, so that a trouble condition on
the power supply will never interfere with the rest of the system. Full
analog measurement of the supervised wiring is transmitted back to
the panel and can be used to detect impedance changes or other
special test functions.
M500R Relay Module
The M500R Relay Module contains two isolated sets of Form C
contacts, which operate as a DPDT switch. The module allows the
control panel to switch these contacts on command. No supervision
is provided for the notification appliance circuit.
M500FP Firefighter Phone Module
The M500FP module is intended to monitor and control a loop of
firefighter phones. It has the ability to differentiate between normal,
off-hook, and trouble conditions. When taken off-hook, a phone will
immediately receive a ringing tone, and the panel will receive an offhook indication. The panel can then connect that off-hook phone to
the main riser for the system.
500 Series Intelligent Module Specifications
General Specifications
Operating Voltage
Communication Line
Loop Impedance
Temperature Range
Relative Humidity
Shipping Weight
Specifications, M502M
Standby Current
External Power Supply
End-of-Line Resistance
External Supply
Standby Current
External Supply
Alarm Current
Specifications, M500R
Standby Current
LED Current
Relay Contact Ratings
15 to 32 VDC
40 Ω max.
32°F to 120°F (0° to 49°C)
10% to 93% noncondensing
M501M: 1.2 oz (37 g)
Others: 6.3 oz (196 g)
M501M: 2.7 in W × 1.7 in H × 0.5 in D
Others: 4.275 in W x 4.675 in H x 1.4 in D
300 µA max @ 24 VDC (one
communication every 5 sec.
with LED enabled)
18 to 28 VDC (100 mV ripple max.)
3.9 kΩ (included)
11.5 mA @ 24 VDC (nominal)
80 mA @ 24 VDC (nominal)
300 µA max @ 24 VDC
(one communication every 5 sec. with
LED enabled)
5.5 mA (with LED latched on)
2.0 A @ 25 VAC (PF=.35), non-coded
3.0 A @ 30 VDC resistive, non-coded
2.0 A @ 30 VDC resistive, coded
0.46 A @ 30 VDC (L/R=20ms), non-coded
0.7 A @ 70.7 VAC (PF=.35), non-coded
0.9 A @ 125 VDC resistive, non-coded
0.5 A @ 125 VAC (PF=.75), non-coded
0.3 A @ 125 VAC (PF=.35), non-coded
Specifications, M500X
Standby Current
Isolation Impedance
Fault Detection Delay
Fault Detection Threshold
Line Restoration Threshold
Specifications, M500DM
Standby Current
450 µA max.
2.25 kΩ to 2.9 kΩ
250 ms min.
4 Volts
7 Volts
750 µA max. @ 24 VDC (one
communication every 5 sec. with
47k EOL)
Alarm Current
970 µA max. (one communication
every 5 sec.); 6 mA (with
LED latched on)
End-of-Line Resistance
47 kΩ (two included)
Specifications, M500M, M500S, M501M
Standby Current
400 µA max @ 24 VDC (one
communication every 5 sec. with
47k EOL); 600 µA max @ 24 VDC
(one communication every 5 sec.
with EOL<1k); 5.5 mA (with LED
latched on)
End-of-Line Resistance
47 kΩ (included)
Specifications, M500FP
Standby Current
2.4 mA max. (one communication
every 5 sec. with LED enabled)
Comm. Line Current
4.0 mA max. (no communication,
LED off, 1200 Ω phone)
Acceptable Phone
1200 Ω (nominal)
End-of-Line Resistance
3.9 kΩ (included)
3825 Ohio Avenue • St. Charles, IL 60174
Phone: 800-SENSOR2 • Fax: 630-377-6495
©2015 System Sensor.
Product specifications subject to change without notice. Visit
for current product information, including the latest version of this data sheet.
MDDS74301 • 02/15