Siemens ST PCS 7 manual RS 485-IS coupler, 11/37, Tasks of the RS 485-iS coupler

© Siemens AG 2007

			Process I/O
		ET 200iSP distributed I/O
			RS 485-IS coupler
■Overview	■Selection and Ordering Data		Order No.
		RS 485-IS coupler	6ES7 972-0AC80-0XA0
		Isolating transformer for connec-

tion of PROFIBUS DP segments with RS 485 and RS 485-iS trans- mission technologies

Tasks of the RS 485-iS coupler

•Conversion of the electrical PROFIBUS DP RS 485 transmis- sion technology into the intrinsically-safe RS 485-iS transmis- sion technology with a transmission rate of 1.5 Mbit/s

•Required to connect intrinsically-safe PROFIBUS DP stations, e.g. ET 200iSP, ET 200iS or devices from other vendors with Ex i DP connection

•Functionality as a safety barrier

•Additional use as a repeater in the hazardous area

•Passive bus station (no configuration necessary)

•Certified according to ATEX 100a

■Design

•The RS 485-iS coupler is an open unit; assembly is only per- missible in housings, cabinets or rooms for electrical equip- ment.

•The RS 485-iS coupler is approved for use in hazardous areas of zone 2.

It must be fitted in a housing which at least corresponds to the IP54 degree of protection. A manufacturer’s declaration for zone 2 (according to EN 50021) is required for the housing and the necessary cable glands.

•The RS 485-iS coupler can be used in a horizontal or vertical position.

•Installation is on a SIMATIC S7-300 rail.

•Diagnostics LEDs on the front panel signal the operating sta- tus.

Connection to PROFIBUS DP

•Connection to standard PROFIBUS DP via standard Sub-D socket (at the bottom on the RS 485-iS coupler, behind the right front door).

Integral bus connection for PROFIBUS DP with RS 485-iS transmission technology

•Connection of PROFIBUS DP with RS 485-iS transmission technology via screw terminals (at the top of the RS 485-iS coupler, behind the right front door)

•The last bus station on the intrinsically-safe PROFIBUS DP segment (not further RS 485-iS couplers) must be terminated by a selectable resistance using the connector, Order No. 6ES7 972-0DA60-0XA0.

Accessories
PROFIBUS connector with	6ES7 972-0DA60-0XA0	B)
selectable terminating resistor
For connection of IM 152 to
PROFIBUS DP with RS 485-iS
transmission technology
S7-300 rails
Lengths:
• 160 mm	6ES7 390-1AB60-0AA0
• 482 mm	6ES7 390-1AE80-0AA0
• 530 mm	6ES7 390-1AF30-0AA0
• 830 mm	6ES7 390-1AJ30-0AA0
• 2000 mm	6ES7 390-1BC00-0AA0
PROFIBUS Fast Connect bus	6XV1 830-0EH10
cable
Standard type with special design
for fast mounting, 2-core,
shielded, cut-to-length; max.
delivery unit 1000 m, minimum
ordering quantity 20 m

B) Subject to export regulations: AL: N, ECCN: EAR99H

11

Siemens ST PCS 7 · November 2007

11/37