Siemens SIMATIC TI505 Manual do Utilizador descarregar pdf (Página 25)

Installation and Set-up

1-14

SIMATIC TI505/TI500 MODNIM User Manual

1.5 Switches and Indicator Lights

The

three switches located on the face of the module behind the access door

are Reset, Self T

est, and Local/Remote, and are described in the following

paragraphs.

The Reset button is a momentary-contact switch which initializes the

MODNIM and initiates the power

-up self test. When you press Reset, all the

indicators turn on for approximately 1 second. Then, all indicators except

TEST go off for about 5 seconds. During this time, the MODNIM runs a

series of diagnostic tests to verify that the hardware components of the

module are operating properly

. In addition, buffers and counters that

service the Modbus Diagnostic Functions are initialized.

If the tests have been successfully completed, only the NIM GOOD and the

PC GOOD (PC/NIM COMM GOOD) indicators will turn back on, while the

TEST indicator turns off. If, however

, the TEST indicator

remains on, run

the User Initiated Self-Test to determine the source of the error

NOTE:

Always press the Reset button after you change any of the

configuration dipswitches or address selection dipswitches. In addition, be

aware that when the MODNIM is reset, no communication can occur from

the host to the module for several seconds.

The T

est button initiates a series of diagnostic tests when it is held down for

3 seconds after a Reset operation. Before running the diagnostic tests,

disconnect all communications cables and install loopback connectors on the

RS-232-C communications ports. These tests are described in more detail in

Section 1.6.

When set to Remote, this two-position toggle switch enables the MODNIM

to perform write operations to PLC memory

. In the Local position, the

MODNIM cannot write to the PLC.

In either position, the MODNIM can monitor PLC memory and mode of

operation. After the MODNIM is set to Online state, local or remote status

is indicated as follows.

• Local

mode is indicated by a

flashing

ONLINE indicator

• Remote

mode is indicated by a

steady

ONLINE indicator

When set to Local mode, only the Read functions 1, 2, 3, 4, 7, 1

1, 12, and 17

plus diagnostics function 8 can be performed. All other functions (write

operations) will be rejected with Exception Code 01.

Switches and

Buttons

Reset Button

est Button

Local/Remote

Switch

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 90 91

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