Remark 3: Check of DIN identifier on receipt¶
If the parameter “Evaluate DIN on receipt” is enabled (default setting), the following DIN identifiers are reserved:
| DIN identifier | Protocol | |
|---|---|---|
| Hex | Dec | |
| 4F | 79 | “Online access” - Programming/OPC with CoDeSys / AC1131 |
| 5F | 95 | 5F_ARCNET (Modbus functions for ARCNET) |
| 6F | 111 | PC331 programming (not used for AC1131/CoDeSys) |
| 7F | 127 | Default DIN identifier for data exchange with function blocks: ARC_REC, ARC_SEND, ARC_STO, ARC_INFO All DIN identifiers except the reserved identifiers can be used for data exchange. |
Note
If the parameter “Evaluate DIN on receipt” is disabled, programming and/or OPC via ARCNET is not possible!
Protocol “ARCNET data exchange” and “5F_ARC”
The protocols “ARCNET data exchange” and “5F_ARC” can be appended.
Right-click PM5x1_ARC_Internal_ARCNET node and select Add object.
The following parameters can be set for the “ARCNET data exchange” protocol:
| Parameter | Default value | Value | Meaning |
|---|---|---|---|
| Size of receive buffer | 8192 | 512…65535 | Receive buffer size in bytes. The minimum size is equal to the maximum size of an UDP telegram. |
| Size of transmit buffer high prio | 4096 | 0…65535 | Size of transmit buffer (in bytes) for telegrams with high priority. |
| Size of transmit buffer low prio | 4096 | 0…65535 | Size of transmit buffer (in bytes) for telegrams with low priority. |
| Size of timeout buffer | 2048 | 0…65535 | Size of buffer (in bytes) for timeout data packages. |
| Number of header data | 10 | 0…1464 | Number of header data to be copied to the timeout buffer for timeout packages (in bytes). |
| Receive broadcast | Disable | Disable | Reception of broadcast telegrams disabled (data packages to all stations). |
| Enable | Reception of broadcast telegrams enabled (data packages to all stations). | ||
| Behavior on receive buffer overflow | Overwrite | Overwrite | Behavior on overflow of the receive buffer. The oldest data packages stored in the receive buffer are overwritten with the new incoming data packages. |
| Reject | Behavior on overflow of the receive buffer. New incoming data are dismissed. |
The following parameters can be set for the “5F_ARC” protocol:
| Parameter | Default value | Value | Meaning |
|---|---|---|---|
| Disable write to %MB0.x from | 0 | 0…65535 | Disable write access for segment 0 starting at %MB0.x |
| Disable write to %MB0.x to | 0 | 0…65535 | Disable write access for segment 0 up to %MB0.x |
| Disable read %MB0.x from | 0 | 0…65535 | Disable read access for segment 0 starting at %MB0.x |
| Disable read %MB0.x to | 0 | 0…65535 | Disable read access for segment 0 up to %MB0.x |
| Disable write to %MB1.x from | 0 | 0…65535 | Disable write access for segment 1 starting at %MB1.x |
| Disable write to %MB1.x to | 0 | 0…65535 | Disable write access for segment 1 up to %MB1.x |
| Disable read %MB1.x from | 0 | 0…65535 | Disable read access for segment 1 starting at %MB1.x |
| Disable read %MB1.x to | 0 | 0…65535 | Disable read access for segment 1 up to %MB1.x |
Note
For Processor Module PM571, 4kB = %MB0.0 .. %MB0.4095 (i.e., not a complete segment) are available for the addressable flag area. Thus, not all Modbus addresses can be accessed.