SIMATIC S7-1200, Communication Board CB 1241, RS485, terminal block, supports Freeport Product type designation CB 1241 RS 485 Input current from backplane bus 5 V DC, typ. 50 mA Power loss Power loss, typ. 1.5 W Interfaces Point-to-point connection ● Cable length, max. 1 000 m Integrated protocol driver — Freeport Yes — ASCII Yes; Available as library function — Modbus RTU master Yes — Modbus RTU device Yes — USS Yes; Available as library function Protocols Integrated protocols Freeport — Telegram length, max. 1 kbyte — Bits per character 7 or 8 — Number of stop bits 1 (Standard), 2 — Parity No parity (standard); even, uneven, mark (parity bit always 1); space (parity bit always 0) 3964 (R) — Telegram length, max. 1 kbyte — Bits per character 7 or 8 — Number of stop bits 1 (Standard), 2 — Parity No parity (standard); even, uneven, mark (parity bit always 1); space (parity bit always 0) Modbus RTU master — Address area 1 through 49 999 (Standard Modbus addressing) — max. number of devices 247; slave numbers 1 through 247, per MODBUS network segment maximum 32 devices, additional repeaters needed to expand the network to maximum configuration Modbus RTU device — Address area 1 through 49 999 (Standard Modbus addressing) Interrupts/diagnostics/status information Diagnostics function Yes Degree and class of protection IP degree of protection IP20 Standards, approvals, certificates CE mark Yes CSA approval Yes UL approval Yes cULus Yes FM approval Yes RCM (formerly C-TICK) Yes KC approval Yes Marine approval Yes Ambient conditions Free fall ● Fall height, max. 0.3 m; five times, in product package Ambient temperature during operation ● min. -20 °C ● max. 60 °C ● horizontal installation, min. -20 °C ● horizontal installation, max. 60 °C ● vertical installation, min. -20 °C ● vertical installation, max. 50 °C ● permissible temperature change 5°C to 55°C, 3°C / minute Ambient temperature during storage/transportation ● min. -40 °C ● max. 70 °C Air pressure acc. to IEC 60068-2-13 ● Operation, min. 795 hPa ● Operation, max. 1 080 hPa ● Storage/transport, min. 660 hPa ● Storage/transport, max. 1 080 hPa Relative humidity ● Operation at 25 ℃ without condensation, max. 95 % Mechanics/material Enclosure material (front) ● Plastic Yes Dimensions Width 38 mm Height 62 mm Depth 21 mm Weights Weight, approx. 40 g
