Some IM-ZB45-COM revisions include 4MB of flash memory for logging data. The manual’s Appendix C describes how to retrieve logs via a proprietary command.
A hidden feature: By setting register 0x100 to a nonzero value (e.g., 30), the device will send a heartbeat every 30 seconds. If the watchdog timer expires, the outputs go to a safe state. This is critical for safety applications. im-zb45-com manual