The PLC-5® processors are single-slot modules that are placed into the left-most slot of a 1771 I/O chassis. They are available in a range of I/O, memory, and communication capability.

PLC-5 processors have ports configurable for either a Data Highway Plus messaging communication link or a Universal Remote I/O link. As a Universal Remote I/O port, it can be configured as either an I/O scanner port or an I/O adapter port. As an I/O scanner port, it monitors and controls the I/O on the link by communicating with the I/O adapters for those I/O. As an adapter port, it communicates only with the I/O scanner port on the link, passing a maximum of one I/O rack of input and output data between the two to provide distributed processing. All PLC-5 processors have Data Highway Plus and RS-232-C/422-A/423-A communication ports. In addition to these ports, each Ethernet PLC-5 processor has an Ethernet communication port, and each ControlNet PLC-5 processor has a ControlNet communication port.

Although each Ethernet PLC-5 processor has on-board Ethernet ports; additional Ethernet ports can be added to any PLC-5 processor system with a 1785-ENET Ethernet Interface Module. PLC-5 processors do not have an on-board DeviceNet port. A DeviceNet port can be added to the system with a 1771-SDN scanner module.

Benefits

• Ladder-logic and structured-text programming
  
• Advanced instruction set including file handling, sequencer, diagnostic, shift register, immediate I/O, and program control instructions
  
• Multiple main control programs for segregation of control tasks
  
• Processor input interrupts and global status flags
  
• Programmable fault response for reacting to a fault before the system goes down
  
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  Timed interrupt routine for examining specific information at specific time intervals
  
• Protected memory selectable by word on selected processors
  
• 512 through 3072 maximum forcible I/O in any mix
  
• Up to 50,176 maximum non-forcible I/O
  
• Processor-resident local I/O (1771 I/O modules)
  
• Extended-local I/O on selected processors (1771 I/O modules)
  
• Universal Remote I/O (1746, 1771, and 1794 I/O modules and 1791 I/O blocks)
  
• DeviceNet I/O (1794 I/O modules, 1792D I/O blocks)
  
• ControlNet I/O on selected processors (1771, 1734, 1794, 1797 I/O modules)
  
• Universal Remote I/O ports can be configured as either an I/O scanner port or an I/O adapter port