Mounting The C200Hw-Prm21; Termination Switch - Omron C200HW-PRM21 Operation Manuals

Mounting the C200HW-PRM21

2-1-5 Termination Switch

2-2

Mounting the C200HW-PRM21

Limitations
The termination switch has two positions. When the switch is set to the right
(as shown below), the termination is disabled. By setting the switch to the left,
the termination is enabled.
Enabling the termination connects the two data lines using a 220 Ω resistor
which is connected to VP and DGND via two 390 Ω resistors (see figure
below). The powering of the terminator resistor ensures a defined idle state
potential on the data lines.
To ensure proper functioning up to the highest baud rate, the bus cable has to
be terminated on both ends of the cable.
VP
390 Ω
B-line
220 Ω
A-line
390 Ω
DGND
The PROFIBUS-DP Master Unit (C200HW-PRM21) can be mounted to the
CPU Rack or Expansion I/O Rack of any CS1, C200HX, -HG, -HE, or -HS
PLC. Refer to the PLC's Installation Guide for details on mounting Units.
There are some limitations on mounting the Master Unit.
• The Master Unit is a Special I/O Unit. It can be mounted in any slot in the
Backplane of a CPU Rack or Expansion I/O Rack as long as its unit
number is not the same as the unit number of another Special I/O Unit
within the system.
• The current consumption all of units mounted on one backplane should not
exceed the maximum output of the power supply. The C200HW-PRM21
consumes up to 600 mA from the 5V supply. Verify the characteristics of
all other units on their respective Instruction Sheets.
• The maximum number of Master Units that can be mounted depends on
the PLC CPU type.
Section 2-2
13