Process Image In "Sniffer" Operating Mode; Mailbox; Can User Data Range; Figure 10: Process Image In "Sniffer" Mode - WAGO -I/O-SYSTEM 750 Manual

WAGO-I/O-SYSTEM 750
750-658 CAN Gateway
6.1

Process Image in "Sniffer" Operating Mode

The CAN user data range on the process image is symmetrical for both data
directions.

Figure 10: Process Image in "Sniffer" Mode

6.1.1

Mailbox

Modules with mailbox functionality have an acyclic communication channel
(mailbox) in the process image. The "Mailbox 2.0" (referred to below as
"mailbox") transmission method is the basis.
If the Mailbox is active (control byte, bit 7 = 0), it is used to transfer
configuration, parameterization and diagnostic data. Byte 1 to byte 6 of the
internal process image are used by default. Additional information about the
"Mailbox 2.0 Transmission Method" is available in the respective chapter in the
appendix.
6.1.2

CAN User Data Range

The CAN user data range is a fixed component of the "Sniffer" and "Transparent"
operating modes (see respective chapter). CAN telegrams are transmitted via the
"Mailbox 2.0" communication mechanism. The mechanism supports the
following two types of telegrams:
• "2.0A Standard Frame"
• "2.0B Extended Frame"
Manual
Version 1.2.0, valid from FW/HW-Version 01/01
Process Image 35