The document describes the architecture of Allen-Bradley PLC systems including the Logix 5570 and 7750 series PLCs. It discusses the CPU, power supply, communication, and I/O modules that make up the systems. Specific modules mentioned include the RM redundancy module, ControlNet communication modules, Ethernet modules, and Flex I/O modules for digital, analog, and RTD input/output.
9. CPU MODEL:1756-L75 LOGIX5575
FEATURES
Feature 1756-L71, 1756-L72, 1756-L73, L73XT, 1756-L74, 1756-L75
Controller tasks
• 32 tasks
• 100 programs/task
• Event tasks: all event triggers
Built-in communication ports 1 port USB(1)
Communication options
• EtherNet/IP
• ControlNet
• DeviceNet
• Data Highway PlusÔ
• Remote I/O
• SynchLink™
• Third-party process and device networks
USB port communication Programming, configuration, firmware flash and on-line edits
only
Controller connections
supported, max
500
Network connections, per
network module
• 100 ControlNet (1756-CN2/A)
• 40 ControlNet (1756-CNB/D, 1756-CNB/E)
• 128 ControlNet (1756-CN2/B)
• 256 EtherNet/IP; 128 TCP (1756-EN2x)
• 128 EtherNet/IP; 64 TCP (1756-ENBT)
Controller redundancy Full support
Integrated motion
• SERCOS interface
• Analog options (encoder input, LDT input, SSI input)
• EtherNet/IP (CIP Motion)
Programming languages
• Relay ladder
• Structured text
• Function block
• SFC
Feature 1756-L71, 1756-L72, 1756-L73, L73XT, 1756-L74, 1756-L75
Controller tasks
• 32 tasks
• 100 programs/task
• Event tasks: all event triggers
1 port USB(1)
10. RM MODULE(REDENDANCY MODULE) 1756-RM2
Attribute 1756-RM 1756-RM2 1756-RMXT 1756-RM2XT
Current draw @ 1.2V DC 4 mA — 4 mA —
Current draw @ 5.1V DC 1.2 A 1.16A 1.2 A 1.16A
Current draw @ 24V DC 120 mA 3.4 mA 120 mA 3.4 Ma
Power dissipation 9.0 W 6 W, max 9.0 W 6 W, max
Thermal dissipation 31 BTU/hr 21 BTU/hr 31 BTU/hr 21 BTU/hr
Connector cables 1756-RMC1, 1 m (3.28 ft)
1756-RMC3, 3 m (9.84 ft)
1756-RMC10, 10 m (32.81 ft)
Slot width 1 slot
Module location Chassis-based, any slot
Chassis 1756-A4, 1756-A7, 1756-A10,
1756-A13, 1756-A17
1756-A7XT, 1756-A4LXT, 1756-
A5LXT, 1756-A7LXT
Power supply, standard 1756-PA72, 1756-PA75, 1756-
PB72, 1756-PB75
1756-PAXT, 1756-PBXT
Power supply, redundant 1756-PA75R, 1756-PB75R, 1756-
PSCA2
None
North American temperature
code
T4
IEC temperature code T4
Enclosure type None (open-style)
Weight, approx 0.29 kg (0.64 lb)
Mounting ControlLogix-XT chassis, single-slot module
11. 1756-CN2R CONTROL NET IO COMMUNICATION
MODULE
Attribute 1756-CN2/C 1756-CN2R/C, 1756-CN2RK/C 1756-CNB/E 1756-CNBR/E
Configuration Standard Redundant Standard Redundant
ControlNet communication rate 5 Mbps
Logix communication
connections
128 40…48
Connections supported, max 131(1) 64
Number of nodes, max 99
Current draw @ 5.1V DC 1100 mA 1300 mA 970 mA
Current draw @ 24V DC 3 mA 1.7 mA
Power dissipation 5.6 W 6.7 W 5.1 W
Thermal dissipation 19.1 BTU/Hr 22.9 BTU/hr 17.4 BTU/hr
Isolation voltage
Standard: 30V (continuous), basic insulation type, ControlNet network to backplane
Redundant: 30V (continuous), basic insulation type, ControlNet A/B to backplane, and
ControlNet A to ControlNet B USB to backplane and USB to ControlNet
No isolation between NAP or USB and backplane
Type tested at 500V AC for 60 s
Weight, approx. 0.26 kg (0.57 lb) 0.293 kg (0.64 lb) 0.26 kg (0.57 lb) 0.293 kg (0.64
lb)
Slot width 1
Module location Chassis-based, any slot
Chassis 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
Power supply, standard 1756-PA72/C, 1756-PA75/B, 1756-PB72/C, 1756-PB75/B, 1756-PC75/B, 1756-PH75/B
Power supply, redundant 1756-PA75R, 1756-PB75R, 1756-PSCA2
ControlNet port 1 ControlNet BNC 2 ControlNet BNC 1 ControlNet
BNC
2 ControlNet
BNC
ControlNet cable 1786-RG6 quad shield RG6 coaxial cable
USB port(2) USB full speed (12 Mbps) — —
NAP port — — 1 NAP RJ45 1 NAP RJ45
NAP cable — — 1786-CP
Wiring category(3)
1 - on ControlNet ports3 -
on USB ports
1 - on ControlNet
ports3 - on NAP ports
12. ControlNet Network ControlNet is a real-time control network that
provides high-speed transport of both time-critical I/O and interlocking
data and messaging data, including upload/download of
programming and configuration data on a single physical media link.
The ControlNet network’s highly efficient data transfer capability
significantly enhances I/O performance and peer-to-peer
communication in any system or application where it is used.
The 1794-ACNR15 adapter is capable of accepting
redundant ControlNet cable media. The 1794-ACN15 is a non-
redundant version. The following diagram shows the FLEX I/O
platform on a ControlNet network
13. Attribute
1794 –ACNR15
I/O module capacity 8
Communication rate 5 Mbps
Power consumption at 24V 7.9 W
Inrush current at 24V 23 A for 2 ms
Power dissipation, max 4.6 W @ 19.2V DC
Thermal dissipation 15.7 BTU/hr @ 19.2V DC
Power supply 24V current
load
330 mA
Power supply 24V output
current, max
450 mA
Power supply input voltage,
nom
24V DC
Operating voltage range 19.2…31.2V DC (includes 5% AC ripple)
ControlNet cable Allen-Bradley RG-6/U Quad shield coax,
part no. 1786-RG6(standard-PVC CM-
CL2)
or 1786-RG6F/A (high-flex)
Isolation voltage Tested @ 850V DC for 1 s, user power to
system
Dimensions (HxWxD),
approx
87 x 94 x 92 mm
3.4 x 3.7 x 3.6 in.
Temperature, operating -20…+55 °C (-4…+131 °F)
-25…+70 °C (-13…+158 °F) – 1794-
ACNR15XT only
FLEX I/O ControlNet Adapter
1794_ACNR15_8SLOT
FLEX I/O ControlNet
Adapter Capable to
connect with 8 FLEX
IO Module
14. 1756-EN2T ETHERNET
COMMUNICATION MODULE
Manufacturer Allen-Bradley / Rockwell
Automation
Communication Speed 10 to 100 Mbps
TCP/P Connections 128
Logix Connections 256
Operating Temperature
32 to 140 degrees
Fahrenheit
15. 1797-RPA ControlNet Ex Coax Drop
Repeater Module
The 1797-RPA functions as part of the fiber repeater hub within
the hazardous area to extend the length of the ControlNet Ex
segments to interlink systems all operating within the area. It
functions as the intelligent starter block for a multiport repeater
and is configured with at least one media adapter.
Attribute 1797-RPA
Fiber media port
adapter capacity 2
Temperature, operating -20…+70°C (-4 …+158°F)
ControlNet cable Quad-shield RG-6 coax
Communication rate 5 Mbps
Noxious gas exposure Tested to severity level G3, ISA-
S71.04-1985
Power dissipation 8.5 W
Dimensions
(HxWxD),approx
46 x 94 x 75 mm (1.8 x 3.7 x 2.95 in.)
94 x 94 x 91 mm (3.7 x 3.7 x 3.6 in.)
installed
Weight, approx. 0.2 kg (0.44 lbs)
Thermal dissipation 29 BTU/hr
