Siemens ST PCS 7 Modules, 11/25, SM 326F failsafe digital input module for floating contacts

	© Siemens AG 2007
			Process I/O
			ET 200M distributed I/O
			F modules
■Overview		■Selection and Ordering Data Order No.

The safety functions of the AS 414F/FH and AS 417F/FH automa- tion systems are matched to the safety-related I/O modules (F-modules) of the ET 200M distributed I/O system. The F-signal modules (DI/DO/AI) in the ET 200M remote I/O stations are able to guarantee plant safety even in the event of a CPU failure. They are of redundant design, and can diagnose both internal and ex- ternal faults. They carry out self-tests for this purpose, e.g. for short-circuit or wire breakage, and automatically monitor the dis- crepancy time defined in the parameter settings. They comply with the requirements up to SIL 3 (IEC 61508) or AK 6

(VDE 0801).

The input modules operate internally with single-channel evalu- ation (SIL 2 sensors), 2-out-of-2 evaluation (SIL 3 sensors) or

2-out-of-3 channel evaluation (only F-AI module). A safety re- sponse is triggered immediately there are any differences. The type of evaluation influences the number of usable inputs (chan- nels). For example, only half of the existing inputs are available in the case of 2-out-of-2 channel evaluation.

The digital output modules enable safe disconnection through a second disconnect path in the event of a faulty output.

SM 326F failsafe digital input module for floating contacts

24 inputs, 24 V DC6ES7 326-1BK01-0AB0 Electrically isolated in groups

of 12

Redundant design possible (module redundancy)

•4 short-circuit-proof sensor power supplies, each for

6 channels, isolated in groups of 3

•External sensor power supply possible

•SIL 2: single-channel evaluation, 24 channels

•SIL 3: 2-out-of-2 evaluation on the module, 12 channels (adjustable discrepancy time)

•Short-circuit monitoring to L+

•Discrepancy monitoring

•Supports time stamping (SOE)

•Diagnostics inside module

•PROFIsafe telegram

•Front connector required: 40-contact

8 inputs, NAMUR [EEx ib]	6ES7 326-1RF00-0AB0
Isolated by channel
Redundant design possible
(module redundancy)
• 8 short-circuit-resistant sensor
power supplies, each for
1 channel, mutually isolated
• SIL 2: single-channel evaluation,
8 channels
• SIL 3: 2-out-of-2 evaluation on
the module, 4 channels
(adjustable discrepancy time)
• Wire break and short-circuit
monitoring (for contacts with
external resistor circuit)
• Discrepancy monitoring
• Diagnostics inside module		11
• PROFIsafe telegram
• Front connector required:
40-contact

Siemens ST PCS 7 · November 2007

11/25