Siemens SIMATIC S7-200 System Manual page 453

S7-200 CPUs that Support Intelligent Modules
The EM 277 PROFIBUS--DP slave module is an intelligent expansion module designed to work
with the S7-200 CPUs shown in Table A-41.
Table A-41 EM 277 PROFIBUS- -DP Module Compatibility with S7-200 CPUs
CPU 222 Rel. 1.10 or greater
CPU 224 Rel. 1.10 or greater
CPU 224XP Rel. 2.0 or greater
CPU 226 Rel. 1.00 or greater
Address Switches and LEDs
The address switches and status LEDs are located on the front of the module as shown in Figure
A-26. The pin-out for the DP slave port connector is also shown. See Table A-45 for a description
of the status LEDs.
Front View of EM 277 PROFIBUS--DP
Address Switches:
x10=sets the most significant digit of the address
x1= sets the least significant digit of the address
DP Slave Port Connector
Figure A-26 EM 277 PROFIBUS- -DP
CPU
CPU 222 DC/DC/DC and CPU 222 AC/DC/Relay
CPU 224 DC/DC/DC and CPU 224 AC/DC/Relay
CPU 224XP DC/DC/DC and CPU 224XP AC/DC/Relay
CPU 226 DC/DC/DC and CPU 226 AC/DC/Relay
9
6
Technical Specifications
Description
9-Pin Sub D Connector Pin-out
Pin # Description
9-pin D
1 Chassis ground, tied to the connector shell
Female
2 24V Return (same as M on terminal block)
Connector
3 Isolated Signal B (RxD/TxD+)
4 Isolated Request to Send (TTL level)
5 Isolated +5V Return
5
6 Isolated +5V (90 mA maximum)
7 +24V (120 mA maximum, with reverse
voltage protection diode)
8 Isolated Signal A (RxD/TxD--)
9 No Connection
1
Note: Isolated means 500V of isolation from
digital logic and 24V input power.
Appendix A
439