# Error message content, body communication

Communication
Description | Error information in relation to a protocol data unit (message)
Data type | HLI_RUMPF_KOMMU
ST path | pCommuErr : POINTER TO HLI_RUMPF_KOMMU; pCommuErr := ADR(gpCh[channel_idx]^.mc_error.satz_r.rumpf.maske.err_mask[0]);
Description | Type of list
ST path | .medium
Data type | UINT
Value range | 1 – function block, 2 – PDU
Description | Code of message
ST path | .typ
Data type | UDINT
Description | Receiver or sender of message
ST path | .partner
Data type | UDINT