PLC-5 Processors

Selecting the Processor Category

Three categories of PLC-5 processor are available:

Standard — Standard PLC-5 processors feature versatile built-in communication options that permit development of a control architecture that is specific to an application, and an advanced programming instruction set.
Ethernet — Ethernet PLC-5 processors offer embedded TCP/IP communication capabilities that let them communicate with other Ethernet PLC-5 processors and host computers. They thus integrate Allen-Bradley architecture into the industry standard TCP/IP network, offering high-performance peer-to-peer communication via use of PLC-5 message instructions. Ethernet PLC-5 processors are optimized for real-time sequential and regulatory control.
ControlNet — ControlNet PLC-5 processors are used for control and information processing. They offer high-speed communication through a ControlNet port. The ControlNet network provides both I/O control faster than the Universal Remote I/O link and peer-to-peer communication faster than the DH+ network. These processors eliminate the need for block transfer programming when communicating with 1771 I/O modules on the ControlNet network that require a one-time configuration and then continuously read or write.

PLC-5 Processor Categories

Processor Category	I/O, Max.	I/O Chassis, Max.	I/O Communication	User Memory, Max.	General Communication Ports
Standard PLC-5 Processor	512 to 3072 (any mix)¬	5 to 93¬	•Processor-resident local I/O •Extended local I/O •Universal Remote I/O •DeviceNet I/OT	•8K to 100K words •protected (PLC-5/26, -5/46, and -5/86 only)	•Ethernet‡ •DH+ •RS-232-C/422-A/423-A
Ethernet PLC-5 Processor	512 to 3072 (any mix)¬	13 to 65¬	•Processor-resident local I/O •Universal Remote I/O •DeviceNet I/OT	•16K to 100K words	•Ethernet •DH+ •RS-232-C/422-A/423-A
ControlNet PLC-5 Processor	Forcible •512 to 3072 (any mix)¬ Non-forcible •3200 to 50176	77 to 125¬	•Processor-resident local I/O •Universal Remote I/O •DeviceNet I/OT •ControlNet I/O	•6K to 100K words •protected (PLC-5/46C only)	•Ethernet‡ •ControlNet •DH+ •RS-232-C/422-A/423-A

¬ This does not include DeviceNet I/O. T This type of I/O in this type of controller system requires a separate I/O scanner installed in an I/O module slot. ‡ These are not on-board ports. They are available only through an interface installed in I/O module slot 0.