Toshiba ICC Multiprotocol Ethernet Interface ASD-G9ETH User Manual download pdf (Page 81)

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ICC

13.3 PCCC

Ethernet-enabled Allen-Bradley legacy PLCs (such as the PLC5E and SLC-

5/05 series) use a protocol called PCCC (Programmable Controller

Communication Commands) to communicate over the Ethernet network. The

interface card supports PCCC for direct connectivity to these PLCs.

If a connection timeout or socket-level error occurs, the driver will trigger a

timeout event as described in section 10.7.4.

13.3.1 Tag Reference

reference to an integer “file/section number” and an “offset/element” within that

file. Reading is performed via the PCCC “PLC5 Read” (DF1 protocol typed

read) service, and writing is performed via the PCCC “PLC5 Write” (DF1

protocol typed write) service.

The formula to calculate which register is targeted in the interface card is

provided in Equation 3.

()

offset10010- number fileregister target +×=

Equation 3

In Equation 3, “target register” ∈[1…1485], “file number” ∈[10…24] (which

means N10…N24), and “offset” is restricted only by the limitations of the

programming software (but is a value of 1485 max). Table 4 provides some

examples of various combinations of file/section numbers and offsets/elements

which can be used to access drive registers. Note that there are multiple

different combinations of file/section numbers and offsets/elements that will

result in the same drive register being accessed.

Table 4: PCCC Target Register Examples

File/Section

Number

Offset/Element

Start Target

N10 1 1

N12 99 299

N11 199 299

N20 7 1007

N24 85 1485

N10 1485 1485

In addition to providing access to the drive registers in their “standard”

numerical locations as mentioned above, the registers can also be accessed in

a special “assembly object” type format by targeting integer file N50. What this

means is that when N50 is targeted for reading, what is actually returned by the

interface card is the user-defined register data as ordered by the Ethernet/IP

produced register configuration array (refer to section 10.8.3). Similarly, when

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 99 100

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