Siemens 6RA7086-6KS22 Operating Instructions Manual page 155

05.05
Serial interface 2 RS485 (G-SST2)
Module C98043-A7001 (CUD1)
Function Terminal
TX+
TX-
RX+/TX+
RX-/TX-
M
For transmission rate =187.5kBd ⇒ 600m
Cable length:
For transmission rate ≤ 93.75kBd ⇒ 1200m
The following must be observed: DIN 19245 Part 1
The potential difference between the data reference potentials M of all interfaces must not
exceed -7V / +12V. If this cannot be guaranteed, then equipotential bonding must be
provided.
Activation of interface 1 or 2:
– Set the baud rate in parameter P783 or P793.
– Set the protocol in parameter P780 or P790.
Siemens AG 6RX1700-0AD76
SIMOREG DC Master Operating Instructions
Connection values/Remarks
X172
56 RS485, 4-wire send cable, positive differential output
57 RS485, 4-wire send cable, negative differential output
58 RS485, 4-wire receive cable, positive differential input,
2-wire send/receive cable, positive differential input
59 RS485, 4-wire receive cable, negative differential input,
2-wire send/receive cable, negative differential input
60 Ground
Connections
6-69