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© 2011 Schneider Electric All Rights Reserved.
EM3555
Modbus Point Map
ZL0093-0A
11/2011
MODBUS POINT MAP
The EM3555 Full Data Set (FDS) features data outputs such as demand
calculations, per phase signed watts VA and VAR, import/export Wh and VAh,
and VARh accumulators by quadrant. The Data Logging function adds log
conguration registers 155-178 and log buffer reading at registers 8000-13760.
The meter supports variable CTs and PTs, allowing a much wider range of
operation from 90V x 5A up to 32000V x 32000A. To promote this, the meter
permits variable scaling of the 16-bit integer registers via the scale registers.
The 32-bit oating point registers do not need to be scaled.
Integer registers begin at 001 (0x001). Floats at 257 (0x101). Conguration
registers at 129 (0x081). Values not supported in a particular System Type
conguration will report QNAN (0x8000 in Integer Registers, 0x7FC00000 in
Floating Point Registers). Register addresses are in PLC style base 1 notation.
Subtract 1 from all addresses for the base 0 value used on the Modbus RS-485
link.
Supported Modbus Commands
Note: ID String information varies from model to model. Text shown here is an
example.
Table 8 Supported Commands
Command Description
0x03 Read Holding Registers
0x04 Read Input Registers
0x06 Preset Single Register
0x10 Preset Multiple Registers
0x11
Report ID
Return string:
byte0: address
byte1: 0x11
byte2: #bytes following w/out crc
byte3: ID byte = 247
byte4: status = 0xFF if the operating system is used; status =
0x00 if the reset system is used
bytes5+: ID string = “Schneider Electric EM3555 Power Meter
Full Data Set” or “Schneider Electric EM3555 Power Meter -
RESET SYSTEM RUNNING RS Version x.xxx” last 2 bytes: CRC
0x2B
Read Device Identication, BASIC implementation (0x00, 0x01
and 0x02 data), Conformity Level 1.
Object values:
0x01: “Schneider Electric EM”
0x02: “3555”
0x03: “Vxx.yyy”, where xx.yyy is the OS version number
(reformatted version of the Modbus register #7001, (Firmware
Version, Operating System).
If register #7001 == 12345, then the 0x03 data would be
“V12.345”).