Msi-Em-I8 Input Expansion Module; Description - Leuze electronic MSI 400 Operating Instructions Manual

3.9

MSI-EM-I8 input expansion module

3.9.1

Description

The MSI-EM-I8 module is an input expansion with eight safe inputs. If fulfills the following tasks:
• Monitoring of connected sensors
For further information: Connecting devices [chapter 4]
• Forwarding of input information to the controller module
The MSI-EM-I8 module cannot be operated alone and always requires an MSI 4xx controller module (see
"MSI.designer" programming software).
It is possible to use multiple MSI-EM-I8 modules simultaneously (see System setup [chapter 3.2]). The
voltage of the internal logic and the test outputs is supplied via the program removable storage device and
the internal safety bus.
Limited short-circuit detection in the input circuits
Ä One MSI-EM-I8 has two test signal generators. One test signal generator is responsible for
the odd-numbered test outputs (X1, X3, X5, and X7), while the other is responsible for the
even-numbered test outputs (X2, X4, X6, and X8).
Ä Short-circuits between test signal generators of a MSI-EM-I8 or MSI-EM-IO84 module are
detected. Between different modules the short circuit detection is then only ensured if the
test gaps of the test signal generators are < 4 ms and the test periods ≥ 200 ms. Short-cir-
cuits past 24 V DC (after High) at inputs that are connected to test outputs are detected in-
dependently of the length of the test gaps.
Ä Please ensure that the odd-numbered test outputs (X1, X3, X5, and X7) at the MSI-EM-I8
are connected to a common test signal generator and that the even-numbered test outputs
(X2, X4, X6, and X8) are connected to another common test signal generator. Therefore,
short-circuits between the odd-numbered test outputs (X1, X3, X5, and X7) cannot be detec-
ted. The same applies accordingly to the even-numbered test outputs X2, X4, X6, and X8.
Make note of this during wiring (e.g. through separate routing or protected lines)!
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