Honeywell VPlex Wiring Limits for the Polling Loop - Application Note

Tech Note Dated 10/5/09

- 1 -



Tech Notes
Tech Support
Updated 10/5/09
Vplex Polling System Application Note

The maximum Vplex device load current, in milliamps (ma
),

that can be connected to the control panel’s polling
loop output terminals without the use of the 4297 extender module, is 128 ma. This maximum load can be
distributed over more than one polling loop branch connecting to the same polling loop output terminals. However,
the sum of all of the polling loop branches must not exceed 12,000 ft. for
unshielded
cable, or 6,000 ft. for
shielded

cable. Tables 1and 2 may be used to
determine the maximum cable
length of each polling lo
op branch based on the
total load current
of all of the devices,
type
of cable (shielded or unshielded), and
size
of the wire (wire gauge)
used on that loop.
Procedure for Determining the Maximum Wire Length per Polling Loop

1.
Use table 1A for
unshielded
cable and table 1B for
shielded
cable.

2.
Determine the maximum device loading on the polling loop branch by adding the load currents
per
device
determined from Table 2. Example: One 4190SN requires 2.0 ma. One 4208U requires 27.3
ma. The total load for
one
4208U plus
five
4190SNs
on the same loop
would be (27.3+ 10.0) =
37.3
ma.

3.
Locate the row in the table
selected in step 1 corres
ponding to the total device load current determined
in step 2.

Example: A total load current of 37.3 ma. corresponds to the
row of
(33-40) ma.


4.
The maximum cable length can now be determined from the size, or gauge, of the wire used in the
cable. Example: The maximum cable length of
No. 20 gauge wire
for a total device load of 37.3
ma

is 4
,680

ft
if either
unshielded
(table 1A) cable or
shielded
(table 1B) cable is used. If No. 18 gauge
wire were used instead, the maximum allowable cable length would be
7,410 ft

for
unshielded
cable
and
6,000 ft

for
shielded
cable.


Table 1A: Unshielded (or non-metal conduit)

Table 1B: Shielded (or metal conduit)
Total Load
(ma @ 11.5) Vdc

22 ga
20 ga
18 ga
16 ga

Total Load
(ma @ 11.5) Vdc
22 ga
20 ga
18 ga
16 ga
1-4
12,000
12,000
12,000
12,000
1-4
6,000
6,000
6,000
6,000
5-8
12,000
12,000
12,000
12,000
5-8
6,000
6,000
6,000
6,000
9-16
7,270
11,710
12,000
12,000
9-16
6,000
6,000
6,000
6,000
17-24
4,850
7,810
12,000
12,000
17-24
4,850
6,000
6,000
6,000
25-32
3,640
5,850
9,260
12,000
25-32
3,640
5,850
6,000
6,000
33-40
2,910
4,680
7,410
11,760
33-40
2,910
4,680
6,000
6,000
41-48
2,420
3,900
6,170
9,800
41-48
2,420
3,900
6,000
6,000
49-56
2,080
3,350
5,290
8,400
49-56
2,080
3,350
5,290
6,000
57-
64
1,820
2,930
4,630
7,350
57-
64
1,820
2,930
4,630
6,000
65-72
1,620
2,600
4,110
6,540
65-72
1,620
2,600
4,110
6,000
73-80
1,450
2,340
3,700
5,880
73-80
1,450
2,340
3,700
5,880
81-88
1,320
2,130
3,370
5,350
81-88
1,320
2,130
3,370
5,350
89-96
1,210
1,950
3,090
4,900
89-96
1,210
1,950
3,090
4,900
197-104
1,120
1,800
2,850
4,520
197-104
1,120
1,800
2,850
4,520
105-112
1,040
1,670
2,650
4,200
105-112
1,040
1,670
2,650
4,200
113-120
970
1,560
2,470
3,920
113-120
970
1,560
2,470
3,920
121-128
910
1,460
2,310
3,680
121-128
910
1,460
2,310
3,680

- 2 -



Tech Notes
Tech Support
Updated 10/5/09

Table 2: Vplex Product Polling Loop Load Current
Product
Description
Load
(ma)
Comment
269SN
Hold up switch
1
Upon power up see II’s.
4101SN
1-RLY out+1 Sup In, + Tamper, S/N
7
Maximum duty cycle assumed
4190SN
1 Sup In, 1 Unsup In, 1 Tamper, S/N
2

4190WH
1 Sup In, 1 Unsup In,1 Tamper, DS
2 High Current
1 Low Current

4191SN-WH
Contact, Recessed, S/N
1

4192CP
Smoke Detector, ION, S/N
320 micro amps stand-bye
400 micro amps alarm
Control determines if LED is on continuously.
4193SN
SIM, 1 Sup In, 1 Unsup In, S/N
1.5

4208SN
8 Sup Ins, 1 Tamper, 1 Out, S/N
33.6
Polling loop power = 33.6 ma or 0.6 ma if 33 ma PS
is used. All inputs assumed used.
4208SNF
2 Class B + 2 Class A Inputs, S/N
33.6
Polling loop power = 33.6 ma or 0.6 ma if 33 ma PS
is used. All inputs assumed used.
4208U
8 Sup Ins, 1 Tamper, 1 Out, DS or S/N
27.3
Polling loop power = 27.3 ma or 0.6 ma if 28 ma PS
is used. All inputs assumed used.
4209U
4 Sup Group ins, DS or S/N
15.5
110 ma max from switched power source.
4275EX
PIR, Mirror, Dual,1 Tamper, DS
1 w/o LED
6 w/LED

4275EX-SN
PIR, Mirror, Dual,1 Tamper, S/N
1.4 w/o LED
8 w/LED

4278EX-SN
PIR, Mirror, Quad,1 Tamper, S/N
1 w/o LED
9 w/LED

4293SN
SIM, Mini, 1 Unsup In, S/N
1

4297
Polling Loop Extender Module
50 + extension loop drain
(128 ma Max)
350 ma when extension loop shorted.
4939SN-WH
Contact, Surface, S/N
1

4944SN-WH
Contact, Recessed, Mini, S/N
1

4945SN-WH
Contact, Surface, Mini, S/N
1

4959SN
Contact, Door, Overhead, S/N
1

5192SD
Smoke Detector, Photo, S/N
1.2 ma w/o LED
2.8 w/ LED
Control determines if LED is on continuously. Use
1.5ma for typical application.
5192SDT
Smoke Detector, P
hoto, Heat Sensor, S/N
1.2 ma w/o LED
2.8 w/ LED
Control determines if LED is on continuously. Use
1.5ma for typical application.
5193SD
Smoke Detector, Photo, S/N
1.2 ma w/o
LED 2.8 w/ LED
Control determines if LED is on continuously. Use
1.5mA for typical application. LED status indication
Upon power up. See II’s.
5193SDT
Smoke Detector, Photo, Heat Sensor, S/N
1.2 ma w/o LED
2.8 w/ LED
Control determines if LED is on continuously. Use
1.5mA for typical application. LED status indication
998MX
PIR, Fresnel, Quad,1 Tamper, S/N
1 ma w/o LED
3 w/ LED

DT7500SN
Dual TEC motion sensor
2.6 ma w/o LED
5.7 w/ LED

FG1625SN
Glassbreak Detector
1 ma
5 ma in test mode

IS2500SN
Pir Motion Detector
1.6 ma w/o LED
4.7 w/ LED

Quest 2260SN
Dual Tech Motion Detector, S/N
8 Alarm LED
6 w/o LED normal mode
3.0 mA in Conditional Microwave mode, no alarm.
VSI
Polling Loop Short Isolator
1.2 w/o LED
5 w/ LED





- 3 -



Tech Notes
Tech Support
Updated 10/5/09
Figure 1: Sample Configurations Utilizing Tables 1 & 2

NOTE: The sum of the individua
l lengths of all of the polling loop branches must not exceed
12,000 ft.
for
unshielded
cable or 6,000
ft.
for
shielded
cable.


Sample Configuration 1:

For Total D (1-n) =
128 ma
;

L=
1,460 ft
.
max, with
# 20 wire
(shielded or unshielded)
L=
3,680 ft
.
max, with
# 16 wire
(shielded or unshielded)





L
System
Control
Dn
D1

Sample Configuration 2:


For Total D (1-n) =
64 ma ;
L=
2,930
ft. max, with
# 20 wire
(shielded or unshielded)
=
7,350 ft
.
max, with
# 16 wire
(unshielded)
=
6,000 ft
. max, with
# 16 wire
(shielded)





Dn
D1
L

System
Control



Sample Configuration 3:


For Total D (1-n) =
32 ma
per L1&L2 loop branches;
L1or L2
=
5,850 ft
max. with
# 20 wire
per branch, (shielded or
unshielded).
However, the limit of 6,000 ft. for shielded cable
restricts each branch to
3,000 ft.

=
12,000 ft
max. for either branch with
# 16 wire
(unshielded)
However, the maximum of 12,000 ft limits each branch to
6,000ft.
=
6,000 ft
max. for either branch with
# 16 wire
(shielded)
However, the limit of 6,000 ft. for shielded cable restricts each

branch to
3,000 ft.











Dn
D1
L
2
Dn
D1
System
Control
L
1


Example:

A Vplex system, using
unshielded
#18 gauge wire, requires devices totaling 30 ma on one branch that is 8,000 ft
long, and 50 ma on a second branch that is 5,000 ft long.
The total load of 50+30 = 80 ma is within the allowable
128 ma and the required length of cable for each bran
ch is also permitted by Table 2. However, the
sum of the cable
lengths
required is 8,000+5,000 = 13,000 ft which
exceeds
the maximum limit of 12,000 ft.

1. From Table 1A, the maximum wire length is 9,260 ft. for the 30 ma branch and 5,290 ft. for the 50 ma branch,
using
unshielded
#18 gauge wire. The 50 ma branch can use its required 5,000 ft. of cable leaving (12,000-5,000)=
7,000 ft. for the 30 ma branch which is insufficient for this branch since the application requires 8,000 ft. of cable.
To solve this application, two 4297 extenders must be used provided the wire length between the control and the
4297 extenders is insignificant (less than 100 ft).

2. The total wire length considered when using a 4297 extender is
the sum of the cable lengths on its input and
output
. By keeping the wire length below 100 ft. from the control to their inputs, the maximum wire length
permitted on each of the extended loops will be the maximum of (12,000-100) =11,900 ft. This will allow the
required 8,000 ft of cable for the 30 ma branch and 5,000 ft of cable for the 50 ma branch to be used without
exceeding the 12,000 ft cable limit.
The use of the two 4297 extender m
odules is thus seen to effectively
isolate the output cable lengths from each other.






- 4 -



Tech Notes
Tech Support
Updated 10/5/09
Using the 4297 Module

The 4297 Vplex extender module may be used
to:
A)

Increase the number of Vplex polling loop loading in a given system;
B)

Extend the total cable length of a specific application;
C)

Provide short circuit isolation from one loop branch to another.

A)

The maximum number of Vplex device loading
that can be placed on one or more polling loops with a
single supporting control panel is 128 ma. If a given control panel can support a total number of devices
requiring more than 128 ma, a 4297 module may be used in the manner demonstrated in Figure 2, below.
Each 4297 module can individually support up to 128
ma
.

The maximum number of 4297 modules
which can be configured as shown in Figure 2 is limited by the
need for a DC power supply to furnish 50ma @ 12 VDC per module. For example, up to 512 ma can be
supported using 512/128 = 4 modules. Since the control panel can separately support 128 ma, only 3 4297
modules would be required, provided the maximum wire length requirements are met. If 4 modules are
used, they would require an additional DC supply
current of (50)(4) = 200 ma., which may be derived
from the control panel’s Aux Power output, if available, or from a separate DC power supply.

The total wire length allowed at
the output of a 4297 module
, as well as for the control panel’s Vplex
output, is limited using Tables 1 and 2 and the procedures described above. In addition, the sum of the wire
lengths of both the input and output of a single 4297 is also limited by 12,000 ft. of unshielded wire and
6,000 ft. of shielded wire, as indicated in Figure 2.

B)

Figure 3 illustrates how a single 4297
can be configured to extend the cable length of a given polling loop
branch. The same limitations described above apply to both the input and output sides of the 4297. Once
again, the sum of the allowable lengths of the input and output sides of the 4297 is limited to 12,000 ft. for
unshielded wire or 6,000 ft. for shielded wire. Only one 4297 can be used per extended loop branch. Never
connect two or more 4297s in tandem on a given loop.

C)

The 4297 automatically isolates a short
occurring on its output from appearing on its input. For example
a short circuit occurring on any one or more of the L
E1
- L
EN
output branches in Figure 2, will not appear
on the control panel’s polling loop output, L
P1
– L
PN
and L
PE.
Thus, if a short circuit occurs anywhere on
the output branch of, say, L
E1
, its 4297 extender will prevent that short circuit from disabling any of the
other branches. Only devices on the L
E1
branches will fail to communicate with the control due to the short
circuit.

- 5 -



Tech Notes
Tech Support
Updated 10/5/09
Figure 2: Using Multiple 4297 Polling Loop Extenders




























L
E
= Total wire length on output side of each 4297.
L
P
=

Total wire length on inpu
t side of each 4297.
L
E1
+

(L
P1
+ L
P2 +
...

L
PN +
L
PE
)
≤

12,000 ft., unshielded;
≤

6,000 ft., shielded

L
E2 +
(L
P1
+ L
P2
+...

L
PN + LPE
)
≤

12,000 ft., unshielded;
≤

6,000 ft., shielded
L
En
+ (L
P1
+ L
P2 +
...

L
PN + LPE
)
≤

12,000 ft., unshielded;
≤

6,000 ft., shielded

Note:

The maximum number of 4297 modules which can be connected
in parallel to a single system control is limited by
the maximum wire lengths specified above and the need for the Aux or Local power source to supply 50 ma per
4297. For example, if five 4297 modules are used, the Aux or Local power source must supply (5) (50) = 250 ma
and the total system load current would be (5)(128)+128 = 768 ma, max. Also, from the above relations;
If (L
P1
+ L
P2 +
...

L
PN +
L
PE
) = 1000 ft., then L
E1
= L
E2
=... L
En

≤
11,000 ft., unshielded

≤
5,000 ft., shielded.











Panel Polling
Loop Output
System
Control
4297
Aux or Local
Power Source
(
50 ma per
Extender)
L
P1
4297
L
P2
L
PN
L
E1
Refer to Table 2 for maximum L
E1
wire length per wire size , wire type, and total unit loads.

L
E2
L
EN
Refer to Table 2 for maximum L
E2
wire length per wire size , wire type, and total unit loads.

Refer to Table 2 for maximum L
EN
wire length per wire size , wire type, and total unit loads.

4297
L
PE
Refer to Table 2 for maximum L
PE
wire length per wire size , wire type, and total unit loads.


- 6 -



Tech Notes
Tech Support
Updated 10/5/09
Figure 3: Single 4297 to
Extend Polling Loop








Polling Loop
System
Control
4297

L
out
L
in
Dn-i
D1-i
Dn-o
D1-o

D1-i + ... Dn-i = 128 max, or per Tables 1 & 2, above.
D1-o

+ ... Dn -o

= 128 max, or per Tables 1 & 2, above.
L
in
+ L
out

≤

12,000 ft., unshielded
,
or per Tables 1 & 2, above, whichever is smaller.


≤

6,000 ft., shielded, or per Tables 1
& 2, above, whichever is smaller.