Introduction; Physical Connections - Siemens LME7 Series Technical Instructions

LME Series
Modbus RTU and BACnet MS/TP Communication

Introduction

The physical connection from the LME7 burner control to the Modbus RTU or BACnet MS/TP
system is made via an external OCI417.10 interface module. The OCI417.10 is compatible with
all LME7... burner controls and PME7... program modules.

Physical Connections

Power
Power to the OCI417.10 must be either 9-24VDC or 9-24VAC (nominal). Power consumption is
2.5W or less. SCC part number AGA15-24 is available as a suitable power supply.
Terminal designations:
Connection to the LME7...
The connection from the OCI417.10 to the LME7... should be made with a 4-wire RJ-11 cable
with reversed connections (voice cable), such as SCC part number TDC207. Maximum allowed
cable length is 3 meters.
Note that while the OCI417.10 is connected, the AZL23... or PC tool ACS410 via OCI410... may
not be simultaneously connected. Connecting multiple interfaces to the LME7... using a multi-
way cable or splitter may result in damage to the connected LME7..., OCI417.10, AZL23..., or
OCI410...
SCC Inc.
Label Function
L+ DC + / AC ~
N- DC - / AC ~
Page 1
Technical Instructions
Document No. LME-1000
Section 8