Roe024rm Updated Page

After the update, use a Modbus master tool (e.g., QModMaster or ModScan) to query Register 0x0000 (Device ID). The response should read 0x0430 (indicating FW 4.3.0). Then, write to a single output coil (Address 0) and verify physical relay click.

Because the Modbus map changed, your PLC logic likely requires modification. Below is a snippet of the updated register map vs. legacy. roe024rm updated

Legacy Map (Pre-update)

Updated Map (roe024rm)

Action Item: In your PLC, increment every Modbus read/write address above 40002 by +1. After the update, use a Modbus master tool (e

Older firmware versions (pre-v.4.2.1) contained a race condition in the output latch. When three or more relays switched states within 2ms of each other, the module would enter a watchdog timeout, forcing a hard reset. In critical systems (e.g., emergency stop chains), this caused nuisance trips. The updated version patches this vulnerability. Updated Map (roe024rm)

Cause: The updated hardware revision (Rev E) includes a new security lock bit. Downgrading to pre-v4.0 is physically impossible. Fix: Plan your update during a scheduled outage. There is no rollback path.