Pccc Object; Pccc Telegram Structure - Wieland samos PRO COMPACT Manual

8.4.7

PCCC Object

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PCCC (pronounced "P C Cube") is used in several PLCs from Rockwell Automation/Allen Brad-
ley, which still continue to be used. It was developed before CIP and EtherNet/IP were defined.
PCCC telegrams are either:
a) Encapsulated in CIP packages (e.g. via EtherNet/IP)
b) The encapsulation of CIP packages.
The SP-COP2-ENI module supports the encapsulation of PCCC data in CIP packages, as
described above under b). For this, the class ID 0x67 = 103 was specified.
The PCCC commands listed in the following table are supported by the SP-COP2-ENI module.
All PCCC-related data with a size of 16 bits (word) are available in the "Little Endian" format.
This means that the byte with the lowest value is executed first.
Table 43: PCCC commands supported by the SP-COP2-ENI module
Type CMD FNC Description
Word Range Write [ch. 8.4.7.2, p. 92]
PLC-5 0x0f 0x00
Word Range Read [ch. 8.4.7.3, p. 92]
PLC-5 0x0f 0x01
Typed Write [ch. 8.4.7.4, p. 93]
PLC-5 0x0f 0x67
PLC-5 0x0f 0x68 Typed Read [ch. 8.4.7.5, p. 93]
Protected Typed Logical Read with 2 Address
SLC 0x0f 0xa1
Fields [ch. 8.4.7.6, p. 95]
Protected Typed Logical Read with 3 Address
SLC 0x0f 0xa2
Fields [ch. 8.4.7.8, p. 96]
Protected Typed Logical Write with 2 Address
SLC 0x0f 0xa9
Fields [ch. 8.4.7.7, p. 95]
Protected Typed Logical Write with 3 Address
SLC 0x0f 0xaa
Fields [ch. 8.4.7.9, p. 96]
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8.4.7.1

PCCC Telegram Structure

Each request telegram comprises 7+5 header bytes.
Table 44: PCCC request header
Name
Length
Vendor UINT
S/N
CMD
STS
TNSW
FNC
Each answer telegram comprises 7+4 header bytes or 7+4+1 header bytes, if the state byte is
0xf0.
Wieland Electric GmbH | BA000970 | 11/2016 (Rev. F)
Data type Description
USINT Header size
Vendor ID of the requester
UDINT Serial number of the requester
USINT Command
USINT State
UINT Transport sequence number
USINT Function code
EtherNet/IP gateway
Command supported by
PLC-3, PLC-5, PLC-5/250
PLC-3, PLC-5, PLC-5/250
SLC 5/03, SLC 5/04, PLC 5,
PLC-5/250, PLC-5/VME
SLC 5/03, SLC 5/04, PLC 5,
PLC-5/250, PLC-5/VME
MicroLogix-1000, SLC 500,
SLC 5/03, SLC 5/04, PLC 5
MicroLogix-1000, SLC 500,
SLC 5/03, SLC 5/04
Size Data range
1 byte 7
2 byte
4 byte 0 to 2
1 byte 0x0f
1 byte 0
2 byte 1 to 65535
1 byte 0x67, 0x68,
0xa2, 0xaa
32 -1
91