The 6ES7135-4MB00-0AB0: SIMATIC DP electronic module with 2 analog outputs for ET 200S, 15 mm width. Output ranges configurable to 4–20 mA or ±20 mA, with 15-bit plus sign resolution. Wire-break detection and group diagnostics are both enablable per channel — you're not guessing whether a loop dropped.
The 15 mm slice fits the ET 200S station alongside other modules. Power comes from the terminal module at 24 VDC — no extra 24 V supply to run, just the backplane bus and L+ from the power module. Max current draw from L+ is 150 mA (unloaded outputs), so budget that in your station power calculation. The outputs are short-circuit-proof and reverse-polarity protected. Wiring: two-wire connection supported; four-wire not. Diagnostics: wire-break and group error (SF LED) are individually configurable. Cycle time max 1.5 ms for all channels — fast enough for most process signals. The response to CPU stop can be set to de-energize, hold last value, or substitute a value. That last one avoids a bump on restart in continuous processes.