Siemens SINUMERIK 840Di Function Manual page 1876

Detailed Description
2.1 Various interface signals and functions (A2)
DB19
DBX12.3 COM1
Edge evaluation: no
Signal state 1 or COM1 active
edge change 0 → 1
Signal state 0 or COM1 inactive
edge change 1 → 0
Application Valid for HMI Embedded;
example(s) a file transfer can be initiated via RS-232-C.
DB19
DBX12.4 RS-232-C Stop
Edge evaluation: no
Signal state 1 or RS-232-C stop active
edge change 0 → 1
Signal state 0 or RS-232-C stop inactive
edge change 1 → 0
Application Valid for HMI Embedded;
example(s) a file transfer can be initiated via RS-232-C.
DB19
DBX12.5 RS-232-C external
Edge evaluation: no
Signal state 1 or RS-232-C external active
edge change 0 → 1
Signal state 0 or RS-232-C external inactive
edge change 1 → 0
Application Valid for HMI Embedded;
example(s) a file transfer can be initiated via RS-232-C.
2-12
Signal(s) updated: cyclic
Signal(s) updated: cyclic
Signal(s) updated: cyclic
NC/PLC Interface Signals (Z1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0