What lands in the panel
The Siemens 6AG1055-1PB00-2BY0 is a SIPLUS LOGO! DM8 12/24 digital expansion module, carrying four digital inputs and four transistor outputs on a 24 V DC supply. It drops onto the LOGO! 8 expansion bus and lives on a 35 mm DIN rail, 36 mm wide (2 DU), 90 mm tall, 55 mm deep, with an IP20 rating for cabinet-mounted service.
Thermal envelope and where it can be installed
Operating range runs from -40 °C to 70 °C; the UL-listed ceiling is 55 °C, which is the number to respect when filing under UL/cUL use, not the higher 70 °C headline figure. Above +2 000 m the curve steps down, with allowances layered against the published barometric pressure bands up to +5 000 m.
Switching budget on the four transistor outputs
Each transistor output is rated 0.3 A at the "signal 1" level; above 55 °C that drops to 0.2 A steady, with 0.3 A allowed only for pulses under 15 s. Plan the steady-state load to the derated figure, not the headline number, when the cabinet sits in a warm enclosure. Output short-circuit protection is built in, so a miswired field cable trips the channel rather than the upstream supply.
Supply window and EMC posture
EMC Class B compliance permits installation in residential areas without extra filtering.
Approvals on record
UL approval is on file under File E120869 with Tmax = 55 °C; FM, CSA, and marine approvals are not carried on this variant.
RFQ posture
Spec the 6AG1055-1PB00-2BY0 into the BOM line against the 0.3 A steady (0.2 A above 55 °C) transistor budget and the 55 °C UL ceiling; both ratings are the ones that decide fit. Send the RFQ for quoted lead time and condition on the order code exactly as printed.