Siemens SINUMERIK 840C Installation Instructions Manual page 1130

01.99 12 Functional Descriptions
12.35 Uninterruptible power supply (UPS) (as from SW 6.3) (Express shutdown)
Interfaces
The PLC user program has available the UPS signals in FY 22 bit 6 and bit 7. The signal
"Power failure" (FY 22 bit 6=1) in the PLC user program can cause an "Express shutdown"
on the MMC.
After implementing "Express shutdown", the signal "Data saved" (flag byte 22 bit 7=1) can
be set in the PLC user program. This signal then travels via the NCK to the CSB output X121
5/6 (see the following example).
Activating "Power failure" signal
The CSB module has a choice of 24 V inputs, from 0 to 7. These signals are activated in the
MD 5030 bits 0 to 7. When using the X121 pin 24/25 the signal "Power failure" must be
released via MD 5030 bit 5.
Note:
The CSB inputs may also be used for other functions. But there is no monitoring of multiple
assignment on the NC part. This must be considered during configuration.
Information on the CSB can be found in section 2.3.6.2 Interface description, Part 2;
Connector requirements.
"Data saved" signal to UPS
The "Data saved" signal can be applied to the CSB output plug X 121 as floating contact
assembly on pin 5 and pin 6.
Connection of UPS via CSB
Prerequisite for this functionality is a CSB module with order number 6FC5 114-0AA02-0AA2.
On earlier releases of the CSB module, alarm 3113 ("Error by access to mixed I/O or CSB")
was activated when a bit was set simultaneous in the NC MD 5030. The UPS message signals
for "Power failure" (X121 24/25) and "Data saved" (X121 5/6) are connected to the X121 plug
of the CSB module itself.
For more details see section Cable distributor CSB in the Interface description, Part 2.
Connection of UPS via PLC I/O
The UPS message signal "Power failure" is sent via a user specified and selectable PLC input
to the PLC user program.
For further procedure see section "Express shutdown".
Express shutdown
Initiation of the "Express shutdown" is carried out from the PLC user program. To do so, the
user must adequately feed the FX 73 module and send an I code data package to the MMC.
When all of the applications signed on in the "Express shutdown" have acknowledged, the
system generates an acknowledgements package to the PLC. See the following example.
12–355
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)