Phoenix Contact IL PB BK DI8 DO4/EF-PAC, Руководство пользователя

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IL PB BK DI8 DO4/EF-PAC
3-4
PHOENIX CONTACT 7725_en_01
3.4 Acyclic communication in DP/V1 mode
3.4.1 The communication mechanism
Whenever data is accessed, a distinction must be made between accessing data from local
bus devices and data from the IL PB BK DI8 DO4/EF-PAC bus coupler:
When accessing the IL PB BK DI8 DO4/EF-PAC bus coupler, use the DP/V1 format. Read
and write accesses can be executed in one step (request -> response).
The PCP data from I/O terminals is addressed via 16-bit object indices. DP/V1 only has
fields for 8-bit indices. Additional parameters have therefore been added to the data block
for use when accessing the local bus, as for PROFIDrive. A sequence involving 2 steps is
used, which follows the PROFIDrive profile:
Read:
1. a) Send the request as a DP/V1 write request (PCP read) to slot x
b) Receive the DP/V1 write response - often automatically via the master
2. a) Send a DP/V1 read to slot x
b) Receive the DP/V1 read response - usually automatically via the master
Write:
1. a) Send the request as a DP/V1 write request (PCP write) to slot x
b) Receive the DP/V1 write response - often automatically via the master
2. a) Send a DP/V1 read to slot x
b) Receive the DP/V1 read response - usually automatically via the master
Table 3-2 Objects on the IL PB BK DI8 DO4/EF-PAC bus coupler
Data type Access to I/O terminal Access to
IL PB BK DI8 DO4/EF-PAC
Slot Index/
dec
PDU length – x 0 3
Master control – x 0 4
PCP status – x 0 5
Terminal activation – x 0 6
Terminal activation/restart – x 0 7
Terminal diagnostics – x 0 12
Cycle count – x 0 20
Cycle error count – x 0 21
ID cycle count – x 0 22
ID cycle error count – x 0 23
Data cycle count – x 0 24
Data cycle error count – x 0 25
I & M functions – x 0 255
PD IN – x 1 to 63 13
PCP access x – 2 to 63 47