5
Creating Project Files—Modbus Master to Devices
Siemens Energy & Automation, Inc.
43
Once you are finished entering data, select
Save
to
save your configuration, then select
Ok
to exit the dia-
log box. Select
Revert
to bring back the previous set-
tings.
5.9
Global Command Registers
This option allows you to specify global commands
for all the devices specified in the Device List. It is only
available for VDEW devices.
The Global Command Registers consist of six regis-
ters. These registers allow the PLC to transmit com-
mands to all the devices in the Device List. To send a
command, all the PLC needs to do is to place the com-
mand values into the appropriate PLC registers, which
the DTU3005 unit reads and then processes.
5.10
Device Diagnostic Registers
This option programs the DTU3005 to send communi-
cations diagnostic information to a set of registers
that can be read by the Modbus Master device. This
option allows the Modbus Master to collect diagnostic
information by reading the registers assigned here.
The information can be used to troubleshoot prob-
lems with the devices and the communications net-
work.
The format and content of the diagnostic registers are
described in detail in
Appendix F
.
1.
To configure the device diagnostic registers,
select
Diagnostics
from the
Edit
menu. The fol-
lowing screen displays:
2.
To enable the sending of diagnostic information to
the Modbus Master, select the
Do you want to set
up device diagnostics registers?
checkbox with
the mouse or the
spacebar
. Then enter the start-
ing register number in the
Modbus Registers
:
field. The register block is 6 bytes long. These are
written to the holding register area (40000 to
49999). Thus entering a 1 in this field represents
1372
L2,3,4 On : L1 Off
14
0
1
1
1
0
1373
L1 On : L2,3,4 Off
1
0
0
0
0
1
1374
L1,4 On : L2,3 Off
9
0
1
0
0
1
1375
L1,3 On : L2,4 Off
5
0
0
1
0
1
1376
L1,3,4 On : L2 Off
13
0
1
1
0
1
1377
L1,2 On : L3,4 Off
3
0
0
0
1
1
1378
L1,2,4 On : L3 Off
11
0
1
0
1
1
1379
L1,2,3 On : L4 Off
7
0
0
1
1
1
1380
L1,2,3,4 On
15
0
1
1
1
1
Table 5.1
7SJ600 Relay Information (Continued)
