What this weighing module does that a standard AI card cannot
The 6AG1138-6AA00-2BA8: It draws 2 W typical from the 24 V DC backplane and fits a 15 mm DIN-rail footprint — 72 mm deep, 57 mm tall — so it slides into a crowded cabinet without forcing a wider enclosure.
Strain-gauge signal chain and resolution limits
The RS-485 port runs at up to 115.2 kbit/s with connectable 390 Ω / 220 Ω / 390 Ω termination resistors, so it can talk to a remote display or a host controller over a 500 m cable run using the SIWAREX 7MH4702-8AG cable. Common-mode voltage is limited to 0.25 V to 4.75 V — if the load-cell shield is not bonded at one end, the common-mode range gets violated and the reading drifts.
Active production and sourcing posture
The lifecycle stage is current. No official successor or cross-reference exists, so if the BOM calls for this order code, source it as specified.
Mounting and integration constraints
The isolation is tested at 707 V DC type test — adequate for 24 V DC control circuits. Diagnostics include a green/red DIAG LED, parameterisable diagnostic alarms, wire-break detection, short-circuit protection, and reverse-polarity protection on the 24 V supply. I&M data (I&M0 to I&M3) is supported, so asset management tools can read the module identity and firmware version without opening the cabinet.