Rockwell Automation 20-COMM-I Interbus Adapter - Manual (Page 65)

Using Explicit Messaging (PCP Communications) 6-3
Peripheral Communications Protocol (PCP) messages are used for
explicit messaging, which is not part of the normal Interbus
I/O data scan. The scanner takes care of all of the details of
establishing a connection for PCP communication services. PCP
communications can be used to:
• Read or write DPI Host (PowerFlex 70, etc.) parameters
• Read or write 20-COMM-I parameters
• Read DPI Host (PowerFlex 70, etc.) faults
• Read 20-COMM-I events
The Command Interface for the SST SLC Interbus scanner must be
enabled for PCP Communications to take place:
• Bit 12 of word 1 in the G File must be set
• Word 5 in the G File must be set to the length of process data
required in the M Files. This value can range from 0 to 224
• Word 6 in the G File must be set to the maximum length of the
command buffer. This value can range from 0 to 128 and must be
non-zero to enable the buffer.
PCP Communications
Name PCP - Index Value Range Access Rights Description
Hex Decimal
Host
Parameters 3001 to
(3001 +n) 12289 to
(12289 + n) Host Parameter
Dependent 3001 (12289 Dec) =
Parameter 1 - etc.
Host Fault
Queue 2FF9 to 3000 12281 to
12288
Read Only Host fault queue
containing up to 8 faults
20-COMM-I
Parameters 2FB6 to 2FEE 12214 to
12270
Parameter
Dependent 2FB6 (12214 Dec) =
Parameter 1 - etc.
20-COMM-I
Event Queue 2FAE to 2FB5 12206 to
12213
Read Only Adapter event queue (8
events)
20COMM-UM007A-EN-P.book Page 3 Tuesday, January 22, 2002 10:52 AM