Mitsubishi Electric MELFA CR800 Series Instruction Manual page 58

4 SAFETY MONITORING FUNCTIONS
(1) DSI Input
(a) Overview
The DSI input is enabled or disabled depending on the states of redundant signals input to the DSI connector
of the safety extension unit. Input of up to eight points is supported.Tab. 4-3 shows the relation of the DSI Input
to DSInA and DSInB.
DSIn input
states
(n = 1 to 8)
(b) Timing diagram
① Normal operation
ON
DSInA
OFF
ON
DSInB
OFF
Enabled
有効
DSIn input
DSIn入力
Disabled
無効
② When a discrepancy between DSInA and DSInB is detected
If a discrepancy between DSInA and DSInB (n = 1 to 8) continues for 100 ms, error H222* (DSI mismatch)
occurs.
ON
DSInA
OFF
ON
DSInB
OFF
Enabled
有効
DSIn input
DSIn入力
Disabled
無効
Enabled
有効
SS1 command
SS1指令
Disabled
無効
(n=1-8)
4-48 Safety Logic Edit
Tab. 4-3: DSI Input states
DSI_A DSI_B
Enabled OFF
ON
OFF
Disabled ON
Fig. 4-19: DSIn timing diagram
Fig. 4-20: DSIn timing diagram
Remarks
OFF -
OFF A 100-ms continuous discrepancy between
DSI_A and DSI_B will cause error H222: (DSI
ON
mismatch) and start SS1.
ON -
100ms