Appendix F: Siemens Notes - Monico CDL Gateway Installation And Operation Manual

v1.05
6.26.09
SLC, MicroLogix, and PLC-5 Style Versions
Since the SLC series do not support the Double Integer data type, these 32 bit integers are
placed in the Floating Point registers. In most cases, the Gateway acts as a DF1 Master and
pushes the engine data into the mapped data registers in the PLC, but it can read data from
the PLC as well. In most cases, the Gain and Unit Conversions (For US units) are already
done which saves substantial programming time in the PLC. Please refer to the latest
Combined Data Map available for download at:
www.monicoinc.com\downloads.
One limitation to be remembered is that Allen Bradley does not allow more than 256
elements under each section. So, if you choose N107:0000 as the starting address, then
N107:0255 is the last valid element. Also, the register ID "07 (as in N07:0000) is reserved
for 16-bit Integers only. The register ID "08" is reserved for the first Floating Point group (as
in F08:0000). Higher numbers above these two values can be used for any data type.
Communications with MicroLogix 1100 over Ethernet must use the DF1 Master over
PCCC/IP option.

Appendix F: Siemens Notes

In versions programmed for Siemens S5 & S7, the Gateway normally uses the Data Block
registers. We normally begin with DB1000:0000, so we do not have conflicts with existing
programs. However, any Data Blocks can be used. In the PLC program, you must create the
Data Blocks and define the names and Data Types. When Using TCP/IP, you must set the IP
address of the Gateway, and the IP address and Slot Number of the PLC PROCESSOR. The
IP address of the Gateway is set after highlighting the ETHERNET port under the
COMMUNICATIONS section in MonicoView. The target PLC address is set after
highlighting the PLC Device in the communications section. The Gateway acts as a Master in
this application and pushes the data into the PLC Data Blocks.
When we act as a Master over Serial Networks, the Gateway needs to be the only Master on
the network. Therefore, when using PPI or MPI communications, you cannot use the
Gateway AND a Siemens HMI, because both devices will be a Master and this will not work.
In this case, your options are to install a CP343-1 Ethernet module, use the Gateway HMI
version to replace the Siemens HMI, or upgrade the PLC processor to a version with onboard
Ethernet.
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