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REC 523
5.1.8.
5.2.
5.2.1.
24
Remote Monitoring and Control Unit
Technical Reference Manual
Table 5.1.7-1
Standard functions available for REC 523 (Continued)
Function
Description
TOD_TO_*
Type conversion from TOD to UDINT / TIME / REAL
TOF
Off-delay timer
TON
On-delay timer
TP
Pulse
TRUNC_*
Truncation toward zero
UDINT_TO_*
Type conversion from UDINT to USINT / UINT / REAL
UINT_TO_*
Type conversion from UINT to USINT / UDINT / REAL / BOOL
USINT_TO_*
Type conversion from USINT to UINT / UDINT / REAL
WORD_TO_*
Type conversion from WORD to DWORD / BYTE
Communication
The remote communication protocols IEC 60870-5-101, Modbus (RTU and ASCII)
and DNP 3.0 are available for REC 523.
The REC 523 includes SPA slave and LON serial communication protocols. In a
customer-specific configuration, special events can be generated via an EVENT230
event function. EVENT230 is documented on the CD-ROM, Technical Descriptions
of Functions, refer to Section 1.8. Related documents.
For more information about communication in REC 523 devices, Chapter
6.Communication.
Auxiliary voltage
For its operation REC 523 requires auxiliary voltage supply. The internal power
supply and charger module of the device forms the voltages required by the
REC 523 electronics. The power supply module is a galvanically isolated (flyback-
type)
DC/DC converter. A green LED indicator on the front panel is lit when the power
supply module is in operation.
When possible, the device should be supplied by an auxiliary supply voltage of the
substation. Otherwise, a small MV auxiliary voltage transformer is recommended to
be used for the supply of the device in secondary substation applications. National
and local electrical safety regulations must always be followed when the device is
connected to the electrical network.
Power supply versions
There are two power supply and charger unit (PSC) versions available REC 523:
• PSC1
• PSC2
The output voltages are identical, but the input voltages are different. The input
voltage range of the power supply module is marked on the front panel of the device.
The power supply version is specified by a letter combination in the hardware
version number of REC 523.
1MRS750881-MUM
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