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Communication with Allen Bradley PLC devices from the Rockwell Automation company

Communication possibilities with Allen Bradley PLC devices from the Rockwell Automation company:
 

DF1 protocol

It goes about the communication protocol designated for the classic serial link (RS232/RS422). The protocol allows the communication either Full-duplex (point-to-point type of connection, RS232) or Half-duplex (1Master x nSlave) with addressing the PLC stations.

This protocol is supported by devices that work with data areas (DataFile), for example: SLC500, MicroLogix, etc.

 
For this communication in the PROMOTIC system can be used:
For easy integration of this driver into the application it is handy to use:

Ethernet/IP protocol

It is built on the NetLinx architecture that is implemented even in DeviceNet and ControlNet networks. Ethernet/IP is administered by the ODVA independent organization that even takes charge of DeviceNet.

This protocol is supported by devices that work with data objects (contrary to the data areas in DF1 protocol). For example the following PLCs: Micro820, ControlLogix, CompactLogix, SoftLogix, DriveLogix, GuardLogix, etc.

 
For this communication in the PROMOTIC system can be used:
For easy integration of this driver into the application it is handy to use:
 
Another way of communication by the Ethernet/IP protocol is based on using the software OPC server RSLinks OEM AB.

Modbus protocol

Modbus is standard, very commonly used protocol for the serial link and Ethernet (the PLC is slave).
- The Modbus RTU protocol is supported for example by: Micro820, MicroLogix 1200/1100/1500.
- The Modbus TCP/IP protocol is supported for example by: Micro820, Micrologix1400.

For this communication in the PROMOTIC system can be used: PmModbusMr - Driver for communication by Modbus Master protocol.

For easy integration of this driver into the application it is handy to use:

ASCII protocol

It goes about the configurable char communication protocol designated for the classic serial link (RS232/RS422). This protocol is supported by some PLC's, for example: Micro820, CompactLogix (on the second serial link port), MicroLogix 1100/1200/1500, etc..

For this communication in the PROMOTIC system can be used: PmChar - Driver for communication by user defined ASCII/BIN protocol.

DH+ protocol

It supports 64 nodes at the most, 230 kB/s (SLC 501 to 3 can't it). It is the proprietary Allen-Bradley protocol. Two methods can be used for the communication:
 
1) HW communication card: It is HW card PkTX for PCI into the PC.

For the communication with this card, SW OPC server RSLinks OEM AB and the PROMOTIC OPC client component can be used.

2) External converter DF1/DH+: For the communication with this converter, the PmABradleyDF1 communication driver can be used.

DH485 protocol

It goes about the communication protocol designated for the serial link. It supports 32 nodes at the most, 19 kB/s (multi-master = each-to-each). It is the proprietary Allen-Bradley protocol. Two methods can be used for the communication:
 
1) HW communication card: For description see protocol DH+.
2) External converter DF1/DH485: (e.g. 1747-UIC or older 1770-KF3). For the communication with this converter, the PROMOTIC communication driver PmABradleyDF1 can be used.
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