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2
10
UNIVERSAL
POWER
SUPPLY
1
L1
POWER
L2
SUPPLY
GND
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. Q7700A1014, 120V, 50/60 HZ; Q7700B1004,
UNIVERSAL POWER SUPPLY, 100 TO 250V, 50/60 HZ.
2
CONNECT PIGTAIL LEADWIRES (Q7700A ONLY):
BLACK—L1
WHITE—L2
GREEN—GROUND
3
MULTI-DROP RS-485 COMMUNICATION BUS. UP TO 31 S7810B MULTI-DROP SWITCH MODULES (SUBNETWORKS) CAN BE CONNECTED TO A SINGLE
QS7800B CONTROLBUS™ MODULE WITHOUT AN RS-485 REPEATER. UP TO 61 S7810B MULTI-DROP SWITCH MODULES (SUBNETWORKS) CAN BE
CONNECTED TO A SINGLE QS7800B CONTROLBUS™ MODULE WITH AN RS-485 REPEATER.
4
INSTALL THE REPEATER BETWEEN THE 30TH AND 31ST SUBNETWORKS.
5
UP TO SIX QS7800B CONTROLBUS™ MODULES CAN BE INTERFACED WITH THE NETWORK INTERFACE UNIT. MAXIMUM OF 222 MULTI-DROP
SUBNETWORKS CAN BE INTERFACED WITH A SINGLE Q7700 NETWORK INTERFACE UNIT.
6
LOCAL SYSTEM (SUBNETWORK). REFER TO S7810B MULTI-DROP SWITCH MODULE INSTRUCTIONS, FORM 65-0228, FOR WIRING INSTRUCTIONS.
THE SUBNETWORKS MUST BE WIRED IN A DAISY CHAIN CONFIGURATION. IT IS RECOMMENDED THAT THE QS7800B CONTROLBUS™ MODULE
7
BE AT ONE END OF THE DAISY CHAIN.
22 AWG (OR LARGER) TWISTED PAIR SHIELDED CABLE (BELDEN 8723 OR EQUIVALENT) IS RECOMMENDED. CABLE SHIELD MUST BE GROUNDED
8
AT EACH END.
MULTI-DROP COMMUNICATION BUS TERMINATION RESISTORS:
9
A. WITHOUT RS-485 REPEATER: MODULES AT THE CLOSEST AND FARTHEST END OF THE DAISY CHAIN REQUIRE TERMINATION RESISTORS. INSTALL
A 120 OHM, 1/4 WATT, RESISTOR BETWEEN TERMINALS a AND b of the QS7800B CONTROLBUS™ MODULE. INSTALL A 120 OHM, 1/4 WATT, RESISTOR
BETWEEN TERMINALS 7 AND 8 OF THE LAST S7810B MULTI-DROP SWITCH MODULE IN THE DAISY CHAIN.
B. WITH RS-485 REPEATER: WHEN AN RS-485 REPEATER IS USED, TWO DAISY CHAIN CONFIGURATIONS ARE EFFECTIVELY FORMED. MODULES AT
THE CLOSEST AND FARTHEST END OF EACH DAISY CHAIN REQUIRE TERMINATION RESISTORS. INSTALL A 120 OHM, 1/4 WATT, RESISTOR BETWEEN
TERMINALS a AND b OF THE QS7800B CONTROLBUS™ MODULE. INSTALL A 120 OHM, 1/4 WATT, RESISTOR BETWEEN INPUT TERMINALS DATA+ AND
DATA- OF THE RS-485 REPEATER. INSTALL A 120 OHM, 1/4 WATT, RESISTOR BETWEEN OUTPUT TERMINALS DATA+ AND DATA- OF THE RS-485 REPEATER.
INSTALL A 120 OHM, 1/4 WATT, RESISTOR BETWEEN TERMINALS 7 AND 8 OF THE LAST S7810B MULTI-DROP SWITCH MODULE IN THE SECOND DAISY CHAIN.
10
FOR Q7700B NETWORK INTERFACE UNIT.
NETWORK INTERFACE UNIT
PLUG-IN
PLUG-IN
A
B
C
9
3
8
7
9
7
+ –
GND
4
RS-485
REPEATER
INPUT
OUTPUT
+ –
GND
9
8
7
9
5
SYSTEM 2
6
S7810B MULTI-DROP
TO LOCAL
SWITCH MODULE
SYSTEM
8 7 6 5 4 3 2 1
S7810B MULTI-DROP
SWITCH MODULE
7800 SERIES
RELAY MODULE
6
TO LOCAL
SYSTEM
8 7 6 5 4 3 2 1
S7810B MULTI-DROP
SWITCH MODULE
7800 SERIES
RELAY MODULE
6
TO LOCAL
SYSTEM
8 7 6 5 4 3 2 1
7800 SERIES
RELAY MODULE
M11347A
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