SIMATIC S7-400, interface module IF963-RS232 with RS232 interface for PTP coupling with CP441 AB CP 441- AA05
SIMATIC S7-400, interface module IF963-TTY with TTY interface for PTP coupling with CP441 AB CP 441- AA05
SIMATIC S7-400, interface module IF963-X27 with RS422/RS485 interface for PTP coupling with CP441 AB CP 441- AA05
SIMATIC S7-400, Backup battery 3.6 V/2.3 AH for PS 405 4 A/10 A/20 A and PS 407 4 A/10 A/20 A for extended temperature range