68 Rockwell Automation Publication PFLEX-RM003E-EN-E - January 2011
Chapter 1 Detailed Drive Operation
Masks
A mask is a parameter that contains one bit for each of the possible DPI ports and
adapters. Each bit acts like a valve for issued commands. Closing the valve (setting
a bit value to 0) stops the command from reaching the drive. Opening the valve
(setting a bit value to 1) allows the command to pass through the mask into the
drive.
Table 1 - Mask Parameters and Functions
The individual bits for each parameter are as follows:
• Bit 0 “Terminal Blk”
• Bit 1 “Local HIM”
• Bit 2 “Ext DPI Conn”
• Bit 3 “Aux DPI Conn”
• Bit 5 “Int DPI Comm”
• Bit 7 “DriveLogix”
Example: A customer's process is normally controlled by a remote PLC, but the
drive is mounted on the machine. The customer does not want anyone to walk up
to the drive and reverse the motor because it would damage the process. The local
HIM (Port 1) is configured with an operator's panel that includes a “REV”
button. To assure that only the PLC (connected to Port 5) has direction control,
the [Direction Mask] can be set as follows:
This “masks out” the reverse function from all ports/adapters except port/
adapter 5, making the local HIM (Port 1) REV button inoperable. See Owners
on page 77 later in this chapter.
Parameter
FunctionName No.
[Write Mask] 669 Determines which ports and adapters have write access to the drive
(parameters, links, etc.). Changes to this parameter only become effective
when power is cycled, the drive is reset or bit 15 “Security” of Par 712 [Write
Mask Act], transitions from “1” to “0”.
[Logic Mask] 670 Determines which adapters can control the drive. When the bit for a port or
adapter is set to “0,” the port or adapter will have no control functions except
for stop.
[Start Mask] 671 Controls which adapters can issue start commands.
[Jog Mask] 672 Controls which adapters can issue jog commands.
[Direction Mask] 673 Controls which adapters can issue forward/reverse direction commands.
[Fault Clr Mask] 674 Controls which adapters can clear a fault.
Direction Mask Bit Setting 00100000
Port/Adapter # 7 6 5 4 3 2 1 0
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