Siemens CPU 315-2 DP Reference Manual

CPU 31x-2 as DP Master/DP Slave and Direct Communication
2-19
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
2.6.1 Diagnosis with LEDs
Diagnostics with LED displays - CPU 31x-2
Table 2-6 explains the meaning of the BUSF LEDs.
The BUSF LED assigned to the interface configured as the PROFIBUS-DP
interface will always come on or flash.
Table 2-6 Meaning of the BUSF LEDs in the CPU 31x-2 as DP Slave
BUSF
Description Remedy
LED off Configuring OK. –
LED
flashes
The CPU 31x-2 is incorrectly configured.
There is no data interchange between
the DP master and the CPU 31x-2.
Reasons:
 Check the CPU 31x-2.
 Check whether the bus connector is plugged in
properly.
 Check for interruptions in the bus cable to the
 Timeout.
 Bus communication via PROFIBUS
interrupted.
 Incorrect PROFIBUS address.
Check for interruptions in the bus cable to the
DP master.
 Check configuring data and parameters.
 LED on

Bus short-circuit

Check the bus configuration.
2.6.2 Diagnostics with STEP 5 or STEP 7
Slave Diagnosis
The slave diagnosis complies with EN 50170, Volume 2, PROFIBUS. Depending
on the DP master, the diagnosis can be read for all DP slaves that comply with the
standard, using 5 STEP5 or 7 STEP 7.
The following sections describe how the slave diagnosis is read and structured.

Siemens CPU 315-2 DP Specifications

General

Memory	64 KB
Power Supply	24 V DC
Order Number	6ES7 315-2AG10-0AB0
Number of DP Masters	1
Number of DP Slaves	124
Load Memory	64 KB
Number of Timers	256
Number of Counters	256
Data Memory	64 KB
Operating Temperature	0 to 60 °C
Integrated Interfaces	MPI, DP
Digital Outputs	Not integrated
Analog Inputs	Not integrated
Analog Outputs	Not integrated
Programming Languages	LAD, FBD, STL
Digital Inputs	Not integrated
Weight	660 g