Rockwell Automation 1785-L20C_L40C, D17856.5.14 ControlNet PLC-5 Programmable Controllers User Manual - Manual (Page 81)

Processor Specifications
Appendix A
A-2
PLCĆ5/20C PLCĆ5/40C
Maximum User Memory Words 16K 48K ①
Maximum Total I/O
Any Mix 512 2048
Maximum Total I/O
Complimentary 512 in and 512 out 2048 in and 2048 out
Program Scan Time
0.5 ms per K word (bit logic)
2 ms per K word (typical)
Maximum NonĆdiscrete I/O DataĆTransfer DataĆTable Size 1000 words in and 1000 words out
Transmission Rate 5M bit/s
Network Update Time (NUT) 2Ć100 ms (user selectable)
Number of ControlNet Ports 1
Number of Redundant Media ControlNet Ports 1
Maximum Number of Nodes per Link without a Repeater 48Ċwith 250 m (approx. 820 ft) cable length
ControlNet I/O ② Maximum Number of Nodes per Link with Repeaters 107
Maximum Link Cable Length without a Repeater
1,000 m (approximately 3,280 ft)Ċwith 2 nodes
500 m (approximately 1,640 ft)Ċwith 32 nodes
250 m (approximately 820 ft)Ċwith 48 nodes
Maximum Link Cable Length with Repeaters
6,000 m (approximately 19,680 ft)Ċwith 2 nodes
3,000 m (approximately 9,840 ft)Ċtypical
Maximum Number of Repeaters in Series per Link 5
Maximum Number of Segments in Series per Link 6
Transmission Rate
57.6K bit/s
115.2K bit/s
230.4K bit/s
NonĆControlNet
I/O Scan Time (Typical)
10 ms per rack @ 57.6K bit/s
7 ms per rack @ 115.2K bit/s
3 ms per rack @ 230K bit/s
NonĆControlNet
Remote I/O Maximum Number of Remote I/O Racks 4 16
Maximum Number of Remote I/O Devices 12 60
Number of Ports Configurable for DH+ or Remote I/O
(Adapter or Scanner)
1 2
Number of Dedicated DH+ Ports 1 0
Number of Serial Ports 1
Number of Coprocessor Ports 1
Maximum Number of MCPs 16
Backplane Current
Maximum 3.0 A
Backplane Current
Load Typical 2.7 A
① The PLCĆ5/40C processor has a limit of 32K words per dataĆtable file.
② See the ControlNet Cable System Planning and Installation Manual, publication 1786Ć6.2.1, for more information.