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Communication with Allen Bradley PLC devices by the Rockwell Automation company

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

The DF1 protocol

It goes about the communication protocol designated for 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 PLC devices that work with data areas (DataFile), for example: SLC500, MicroLogix, etc.

For this communication in the PROMOTIC system can be used:
- PmABradleyDF1 - Driver for communication with Allen Bradley PLC devices by the DF1 protocol
For easy integration of this driver into the application it is handy to use:
- Preconfigurations in group "Allen Bradley - PLC device"

The 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 PLC devices that work with data objects (contrary to the data areas for the DF1 protocol).
For example the following PLC devices: Micro820, ControlLogix, CompactLogix, SoftLogix, DriveLogix, GuardLogix, Micro850, Micro870 etc.

For this communication in the PROMOTIC system can be used:
- PmABradleyCIP - Driver for communication with Allen Bradley PLC devices by the EtherNetIP/CIP protocol
For easy integration of this driver into the application it is handy to use:
- Preconfigurations in group "Allen Bradley - PLC device"


Another way of the communication by the Ethernet/IP protocol is based on using the software OPC server RSLinks OEM AB.

The Modbus protocol

Modbus is standard, very commonly used protocol for Ethernet-client and for serial link (PLC device 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 the Modbus Master protocol.
For easy integration of this driver into the application it is handy to use:
- Preconfiguration "PmModbusMr - Communication set with data and panel for non-defined device"

The ASCII protocol

It goes about the configurable char communication protocol designated for serial link (RS232/RS422).
This protocol is supported by some PLC devices, 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.

The 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.
For communication of the PROMOTIC application two methods can be used:

1) HW communication card: It is HW card PkTX for PCI into the computer.
For communication of the PROMOTIC application with this card, OPC server RSLinks OEM AB can be used - see Communication by OPC interface.
2) External converter DF1/DH+: For communication of the PROMOTIC application with this converter, the PmABradleyDF1 communication driver can be used.

The DH485 protocol

It goes about the communication protocol designated for serial link.
It supports max. 32 nodes, 19 kB/s (multi-master = communication each-to-each).
It is the proprietary Allen-Bradley protocol.
For communication of the PROMOTIC application two methods can be used:

1) HW communication card: For description see DH+ protocol.
2) External converter DF1/DH485: (e.g. 1747-UIC or older 1770-KF3). For communication of the PROMOTIC application with this converter, the PmABradleyDF1 communication driver can be used.
PROMOTIC 9.0.27 SCADA system documentation MICROSYS, spol. s r.o.

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