RMC75P CPU Module

PROFIBUS is a vendor-independent, open fieldbus standard for a wide range of applications in manufacturing and factory automation. This high-speed fieldbus was designed especially for communicating between programmable controllers and distributed I/O such as the RMC75 motion controller.

Up to 126 nodes can be connected to a single network spanning up to 14km. The RMC75P module supports data rates up to 12Mbaud, permitting high-speed on-the-fly downloads of positions and parameters to the RMC module and high-speed uploads of motion profile and status information to the host controller. The RMC75P’s PROFIBUS interface gives the flexibility of several operating modes. Select the mode that best fits your application and PROFIBUS master’s capabilities.

Features

One PROFIBUS port
One serial RS-232 Monitor Port
2 rotary switches to set the PROFIBUS station address.

Part Number

The part numbers of the RMC75P is RMC75P. Like all RMC70 CPU modules, the RMC75P can only be ordered with an axis module.

For example, RMC75P-MA2 is an RMC75P with a two-axis MA2 module.

Specifications

General
Weight	239 g + 7 g (connector)
PROFIBUS-DP Interface
Data Rate	9.6 kbaud up to 12 Mbaud
Isolation	2500 VAC
Product Identifier Number	0x07E1
Features Supported	Sync Mode, Freeze Mode, Auto-baud rate detect
Valid Station Addresses	0-99 (set by rotary switches on faceplate)
Connector	Standard PROFIBUS-DP DB-9 (use termination in cable connectors as per PROFIBUS specification)
RS-232 Monitor Port
Connector	DB-9 Male
Cable	Null modem
Protocol	Allen-Bradley DF1 Full-Duplex, with CRC error detection
Settings	38400 baud, 8 data bits, no parity, 1 stop bit, no handshaking

LEDs

Controller LED

This bi-color (red/green) LED has the following states:

State	Description
Steady Off	No power.
Steady Green	RUN Mode
Flashing Green (Slow)	PROGRAM Mode
Flashing Green (Fast)	Updating Flash or a controller restart is pending.
Flashing Red	The device is in the loader. This should occur briefly when the controller is powered up. If this occurs during normal operation, an error has occurred in the controller and it must be reset. Cycle power to the RMC75 to reset it. Causes: Power Interruption In certain cases, a power interruption to the RMC may cause it to go into the loader. Even a very short interruption, such as 20 msec, can cause problems. This type of interruption cannot be measured with a standard multimeter. For accurate power supply verification, use an oscilloscope or similar high-speed monitoring device. Firmware Bug Certain firmware bugs will cause the RMC to go into the loader. If this occurs, and power interruptions have been ruled out, contact Delta Technical support.
Steady Red	Non-Recoverable major fault. That is, the module cannot boot at all, not even into the loader. The module will likely need to be shipped back to Delta for repair. Some things to try to get it into the Loader (to be done at the direction of technical support) include removing all expansion and axis modules, and setting the Force to Loader jumper under the axis module.

Net LED

The NET LED is located below the Controller LED on a gray background.

State

Description

Steady Off

The RMC's PROFIBUS channel is not communicating control data with the PROFIBUS master. See the Troubleshooting PROFIBUS topic for possible reasons.

Steady Green

The RMC's PROFIBUS channel is properly communicating control data with the PROFIBUS master.

During normal operation, this LED should be steady with no flickering.

Note:
These are the only two LED states of the NET LED, but it is possible to have the Net LED flashing or flickering green, which indicates that the RMC75P is going on- and off-line on the PROFIBUS channel and generally indicates a network or configuration problem.

Note:
The Monitor Port does not affect any LEDs on the RMC75.